landolts chart Time table and standard vision

A Landolt C, also known as a Japanese Vision Test, Landolt ring or Landolt broken ring, is an optotype, i.e. a standardized symbol used for testing vision. It was developed by the Swiss-born ophthalmologist Edmund Landolt. The Landolt C consists of a ring that has a gap, thus looking similar to the letter C. The gap can be at various positions (usually left, right, bottom, top and the 45° positions in between) and the task of the tested person is to decide on which side the gap is. The size of the C and its gap are reduced until the subject makes a specified rate of errors. The minimum perceivable angle of the gap is taken as measure of the visual acuity. It is generally practised in the laboratory.[1] The stroke width is 1/5 of the diameter, and the gap width is the same.[2] This is identical to the letter C from a Snellen chart. The Landolt C is the standard optotype for acuity measurement in most European countries. It was standardized, together with measurement procedures, by the German DIN, as DIN 58220 (now EN ISO 8596). 1909 International Academy of Ophthalmology and the International Organization for Standardization (ISO-International Organization for standardization) randol updated in the ring (Landolt ring or ring randol updated) adopt universal time table, diameter 7.5mm, thickness 1.5mm, thickness 1.5mm of a gap to sipyo jeonghago billed at the unit, based on this, of various sizes were ever write sipyo. 5m distance is smaller than the table when the unit can not read sipyo the unit when read at the table based on the visual acuity of 1.0, and the sight is defined as follows. This minimum time is 1 minute (= 1 '), the visual acuity is 1.0. However, the gap spacing Vision 1.0 sipyo somehow have 1.5mm Let's calculate that. <Picture> measuring distance visual acuity (D) 5m, visual theta = 1 ', y spacing of cracks was established, the following expression can be seen that.  namely, Landolt ring gap spacing in the table when the unit is 1.5mm. standards of human visual acuity is 1.0, but 1.5 also 2.0 if bigger, most people of my eye sight better than the other people think this is a misconception. Most of these people are primitive, myopia and normal eye fatigue than those with sight comes quickly.

The glasses reflect the personality of a person

The glasses reflect the personality of a person

The glasses reflect the personality of a person

Choose a pair of sunglasses is also a matter of style

Article written by Carl Zeiss Vision. 

They are not only a tool for visual aid, but also a fashion accessory. The glasses allow you to express your personality and your style check. But that glasses can say about a type of person?

The face shape plays a key role in choosing the right frame How to find the link How do I find the perfect frame for my face , but there are other factors to consider. A consultant experienced optical quickly recognize the right kind of frame for the face shape and personality type of your client. They know the two basic types of people: the kind who "do not want glasses", ie you want to use a frame that fits your face as smoothly as possible and that is extremely discreet and type more influenced by fashion and see their glasses as an accessory. But are these really the only two "categories"? Studying it in detail we find some interesting results. Basically, there are three distinct groups of eyeglass wearers:

Those who enjoy fashion sunglasses

The  king  of style:  this people who often have more than one pair of glasses. For them, nothing is too fancy or modern. Always with the most current model and ideally with tinted lenses: since you like and that is according to your mood and / or clothing, everything combines. Creative and outgoing consider your glasses complement the visual.

The love for brands:  give value to brands and models, even when they choose their clothes. The choice of glasses these people is influenced by brands. Only frames of the most famous designers in the world can give elegance to your face. Additionally, the glasses should also be in tune with the rest of his style - the look has to be impeccable.Fans of sunglasses brand also bet on good quality lenses. In short, they know that quality has its price, but also justified.

Degree without glasses - just the style:  the function without corrective glasses are sold in stores as a fashion accessory for the face. Glasses "nerd" glasses "GG" style 70's style glasses and John Lennon are used in fashion alternative for people who do not need, but want to wear glasses to complement the look. It takes experience to choosing eyeglass lenses, however, large frames are only really well with thin lenses of plastic, which makes its use more comfortable. The optics are also good counselors in choosing colored lenses.

Those who like glasses practical

The focus on solutions : such a person must first get used to wearing glasses. When you do an eye exam that detects the need for some sort of visual aid, what matters is that the glasses fulfill their function. That is, only want one thing: being able to see well again, then choose the frames and lenses that are right for your type and vision problem. For people who wear glasses for the first time, choose frames and lenses as light as possible and easy to clean can greatly help in adaptation.

The reserved:  these people want glasses that have the minimum possible frame for passing almost unnoticed. Some accept only rimless glasses. Corrective lenses, high refraction can be used to disguise the degree of prescription, because they are thinner than the standard type to the same degree. Therefore, even in cases of high degrees, will not have his glasses looks "Coke-bottle". This type of user is usually faithful to their glasses for years and when I finally replace them with new ones, end up choosing glasses very similar to the old ones.

The connoisseur:  "I just want the best for my eyes." This phrase is on the tip of the tongue of this type when user goes to a viewpoint. He knows terms like bifocals, progressive lenses and anti-reflective treatment. When choosing corrective lenses, consumer-oriented quality pay less attention to price and focus more on the performance of new glasses due to their special needs. The frames should also be according to your personal standards of quality.

Sunglasses for active people

The collector:  this type of user is the glasses as precious objects to be displayed proudly.He collects them with passion and style would change every day if I could. There are too concerned if the glasses will match all visual and all occasions, all styles are accepted, the rimmed the metal and multicolored. If interested also by colored lenses that match the frames of eyeglasses and lenses even for curves, as the line ZEISS Sport.

The completion:  these people like to be prepared for any situation, this means that the frames should be: attractive but not flashy; lightweight, but sturdy, and, of course, must adapt to perfection. Generally, they are not looking for vanities of fashion, but lenses that can do everything, or like multiresistant sunglasses and photochromic lenses, so no need to switch glasses to see far or near, or when do Sol not.

The everyday hero:  people who radiate vivacity and action. They are always on the move and spend too much time looking for his glasses. We say glasses in the plural, because these people need a pair of glasses to read and another to see from afar. However, two pairs of glasses are not enough, because these "hurricanes" need a pair in each corner of the house, how to cook in the kitchen, in the bathroom to apply makeup in the room to watch TV and the bedside to read. Besides, we also need to see clearly and drive to work.This is why they need to have a pair of glasses at each place or use a chain to hold both types of glasses in the neck - so avoid losing them. For busy people, lenses and frames "unbreakable" are key, since your glasses tend, with some frequency, appearing under a pile of documents to be dropped from the table or hang on the car.

Carl Zeiss

The German group Carl Zeiss is an international leader in the optical industry. For over 164 years, contributes to global technological progress in serving markets microscopy, semiconductors, medical systems, manufacturing technology and optical technology to consumers. With innovative technologies and solutions, Carl Zeiss is a world leader in the production of semiconductors, industrial technology, microscopy, ophthalmic optics and optical optronic. About 24,000 employees generated in fiscal year 2010-11, sales of 4237 billion euros. The company's headquarters are located in Oberkochen, Germany.

Carl Zeiss Vision

The optical industry expertise from Carl Zeiss meets and ophthalmic solutions with a mark of international force. This sector invests in technology research and develops products and services of the highest quality. In 2012, the company celebrates 100 years of its lenses precisão.Com about 11,500 employees, this sector from Carl Zeiss is a world leader in the manufacture of spectacle lenses. Only in the year 2010-11 has generated an income of 849 million euros. With a complete portfolio of optical products, the company has 35 distribution centers, more than 100 representations and 15 manufacturing centers distributed across Europe, North America, South America and Asia. Carl Zeiss Vision is today the leader in technology and innovation and high-precision optics. To learn more about Carl Zeiss Vision, visit  http://www.zeiss.com.br/ melhorvisao .

Epson launches high-tech multimedia spectacles

Epson launches high-tech multimedia spectacles and attractive price

Moverio viewed from the front with its exclusive season.

The Epson decided to be more realistic and launched a glasses that can be very useful and enjoyable for an admirer of photos, videos and web access. While Google is concerned to develop a sunglasses like for people to walk on the street with him, Epson has put the sale a model that has all the features, but without allowing the user to go around with him.

Moverio seen behind with his mini displays

The glasses Moverio replaces conventional lenses for mini high resolution displays that reproduce multimedia content. The user can connect their glasses via WiFi or wired to a station portable touch screen Epson exclusive, managed by the operating system Android.Connecting to the internet and the Android system allows the user to customize their multimedia station by choosing their applications playing music and favorite videos, making the operation of the equipment more enjoyable. Moverio can also play videos in 3D, further enriching the user experience you can share all your content through social networks via WiFi Being managed by Android, Moverio the user can use his glasses and also to read emails and surf the internet. Moverio is sold in the United States through the Epson online store at 700 dollars. To access the online store for this product, click HERE. below Watch the promotional video on the glasses Moverio.

Newly discovered cells in the limbus of the cornea can cure eye diseases and prevent blindness

Newly discovered cells in the limbus of the cornea can cure eye diseases and prevent blindness

Scientists at the University of Southampton, UK, have discovered specific cells in the eye that can lead to a new procedure to treat and cure eye diseases that cause blindness.

The study showed that cells called stromal corneal limbus, taken from the front surface of the eye has properties of stem cells and can be grown to create retinal cells.

The discovery could lead to new treatments for eye diseases such as retinitis pigmentosa or age-related macular degeneration, a common cause of vision loss in older people and that will affect about one in every three people in the UK aged 70.

Moreover, the study suggests that the use of cells of limbal corneal in humans would be beneficial since it would avoid complications with infection or rejection because the cells of the eye removed are returned to the same patient.

"This is an important step in our research into the  prevention  and treatment of blindness and eye diseases. We were able to characterize the stromal cells of the corneal limbus that lie on the front surface of the eye and identify corneal layer which they came. Then we saw that these cells in culture assumed properties of retinal cells, "says study leader Andrew Lotery.

The team is now investigating whether these cells can be removed from the front of the eye and can be used to replace diseased cells in the back of the eye on the retina. If successful, this method could open new ways of treating people with conditions that can cause blindness.

According to the investigators, this is a promising discovery since the corneal limbus is one of the most accessible of the human eye and representing 90% of the thickness of the front wall of the eye. Therefore cells can be easily obtained from this area with little risk to vision. "However more needed  research  to develop this approach, before being used in patients, "concludes Lotery.

Review Essilor Optifog

Review Essilor Optifog

Article written by Paulus Maciel.  Rights Reserved.

readership of The last piece on the lenses Essilor Optifog was surprising, but I realized that friends want more information, especially regarding the objections still present on the news. Below is a summary given by Essilor about the product: " The haze appears on the lenses when there is a sudden change in temperature between the two environments.'s the effect of condensation. When contacting the lens, the moisture condenses into tiny droplets and form an opaque film on the whole lens surface. Haze briefly blocks your vision. lenses antiglare Optifog offer the best and most lasting solution against haze when activated by Activator Optifog. " Review: This matter is very practical because it could Essilor of samples Optifog for me to test. The results pleased both, I took my camera and recorded walkthrough test I conducted, which yielded enough content to prepare this review. I hope you, my friend, enjoy the work. Essilor lens Fogproof Optifog is not alone, because it needs to receive the activating substance Optifog that will be sold to the optics through the "Alliance Laboratories." In short, consumers who purchase lenses Essilor Optifog also need to acquire the activating substance, known commercially as "Activator". activator The unit comes in a kit consisting of:

• 1 Packaging Kit (box).
• 1 Optifog Activator 5ml.
• 1 Operating Instructions.
• One special scarf.

Stay tuned to the validity of the activator which is 3 years from the date of manufacture of the same. The manufacturing date and expiration are printed on the bottom cover of the kit.

To test, I used:

• 1 Activator Optifog.
• One special scarf.
• 1 Lens Optifog.
• One common anti-glare lens.
• 1 cup warm water.

The practical test aims to prove the efficiency of the technology Fogproof Essilor Optifog through the correct use of activating substance, as well as other items that make up the kit. The test will also serve to answer questions concerning the misuse of anti-glare lenses activator in common and also questions about the durability of application and durability of 5ml of activator.

Now we start the test by doing the step by step application launcher in Essilor lens Optifog.

1. Wash the lens Optifog with cold water and mild detergent.
2. Dry Optifog lens with a soft tissue.

From now on, I will post pictures large so you do not miss any detail of the test.

     3rd. Apply one drop of the activator on the outer surface of the lens Optifog.

4th. Use of the kit tissue and to spread the drop well activator across the outer surface.

       5th. Apply one drop of the activator on the inner surface of the lens Optifog.

        6th. Use of the kit tissue and to spread the drop well activator across the inner surface. 

         7th. Use a glass with warm water to simulate a situation of haze. 

         Eight. Rest the lens Optifog the mouth of the cup with warm water. The lens does not really blurs.

A constant question is whether the optical activator also works on anti-reflective lenses common. The best way to answer this is by repeating the above test, but now changing the lens Essilor Optifog by a conventional anti-glare lens. For the test has impartiality, I will post the step by step the same way I did in the previous test. Come?

1. Wash the lens Optifog with cold water and mild detergent.
2. Dry Optifog lens with a soft tissue.

From this step, I use large photos:

    3rd. Apply one drop of the activator on the outer surface of the lens anti-reflective common.

    4th. Use of the kit tissue and to spread the drop well activator across the outer surface.

   5th. Apply one drop of the activator on the inner surface of the lens anti-reflective common.

    6th. Use of the kit tissue and to spread the drop well activator across the inner surface. 

    7th. Use a glass with warm water to simulate a situation of haze. 

    Eight. Rest the joint anti-reflective lens in the mouth of the cup with warm water. The lens blurs.

Conclusions about the practical test:

1. The lens Essilor Optifog actually not tarnish when the activating substance is applied correctly on both surfaces of the lens.
2. The application of the activating substance, even when following the steps recommended in anti-glare lenses does not generate the common benefit of anti-fog.

The application of the activating substance holds the lenses Optifog without blurring for one week, provided that the lenses that were applied not washed with water and detergent. If the lenses are rinsed, it will require a new application of the activating substance. Throughout the week, the lenses may be dry cleaned with special scarf that came in the kit activator.

The above explanation also answers questions about the durability of 5ml bottle of activator, that is, the bottle will be maximum if you wash your lenses just once a week. The durability of the bottle will decrease as the frequency of cleaning the lens by the user. Contents of the bottle is 5ml activating substance. If "1 ml" equals 20 drops will render the bottle 100 drops. Optifog If the user uses with minimal applications this is one week (four drops), the bottle will last 25 weeks (6 months and 1 day). In short, the minimum consumption is 2 bottles per year.

For more information, contact your consultant Essilor. If you are a consumer, look for a Varilux Specialist store nearest you.

I hope once more have contributed to his knowledge of optical technology and its products. Wait for more reviews of eyeglass lenses and treatments!

Part 2 - Solving Problems and Adaptation Eyeglass Sale

Part 2 - Solving Problems and Adaptation Eyeglass Sale

Article written by Paulus Maciel.  Rights Reserved.

Here we are to start the first item that may hinder the sale or adaptation of an eyeglass consumer, the dreaded "thick lenses." Whenever one approaches the subject "thick lens" arises famous thick lens calculations. I would like to ask your permission to conduct this matter without using this calculation. I propose a more agile approach to preventive and optimal terms of thickness results in the final product. All this based on over 12 years of experience from solving problems of adaptation. this and the other matters, I'm using the very method of "preventive sale" that is, everything that can go wrong after the sale of the glasses is eliminated during sale of the same, through the processes of history taking, examination prescription, frame choice, choice of lenses and taking action. preventive Thinking on sale, the four aspects that influence the thickness of the lenses are:

1. Choice of frame
2. Prescription versus refractive index
3. Inaccurate measures of the rim
4. Glasses previous decentered

We'll cover in a very objective each of these four aspects, starting with the choice of frame.

Pictured below is an example of poorly chosen frame, where we can see the lack of centralization of the lens relative distances of the individual pupil.

In another photo, we can see a better centering of the lens relative distances of the model pupil. This point is fundamental to the proportional reduction of the thickness of the lenses, the centralization of the frame in the user's face.

Let me give you some practical examples of centralization of the frame using a model of acetate with the following measures:

• Bridge = 22mm
• Aro = 47mm
• Biggest = 47mm diagonal
• Vertical Rim = 36mm

In this first example, we use a ready CR39 lens with +6.00 spherical mounted "frame" model with a 35mm DNP in both eyes. Mounting height centered.

The value of the sum of the bridge + frame rim is 69mm, that is, a value of measurement of PD. This approach measures centered lens to the rim, causing the center to 7.8mm stay in center of ring and also distributes the thickness between nasal and temporal portion of the frame.

Although both edges being left with an elevation of 4.6mm, has the edge of ethyl 4,5 mm, which disguises very leaving the final appearance very interesting.

In this second example, we use the same CR39 lens prepared with spherical +6.00 mounted on the "framework model" with a DNP 30mm in both eyes. Mounting height centered.

The value of the sum of the bridge + frame rim is 69mm, that is, a value larger than 9mm DP. This inequality of measures made the lens would not be centered on the rim, leaving the center thinner than the previous example but with a high nasal 6mm, that is, thickness 30% more than the previous example. The final result showed a lens much thicker than that on the nasal and temporal. Glad that the frame has no nameplate, but the same adjustment would be difficult.

In this third example, we use a CR39 lens prepared with spherical -6.00 mounted on the "framework model" with a  DNP 35mm  in both eyes. Mounting height centered.

The value of the sum of the bridge + frame rim is 69mm, that is, a value of measurement of PD. This approach measures centered lens to the rim, causing the center to 2.2mm stay in center of ring and also distributes the thickness between nasal and temporal portion of the frame.

Both edges were at a thickness of 5.6mm, this lens is 1.1 mm away from the edge of acetate having 4.5 mm. If the editor is "beast" will be difficult leftovers lens off the rim. In short, a great result thick, even for a CR39 with 6.00 diopters spherical negative.

In this fourth example, we use the same CR39 lens prepared with spherical -6.00 mounted on the "framework model" with a  DNP 30mm  in both eyes. Mounting height centered.

The value of the sum of the bridge + frame rim is 69mm, that is, a value larger than 9mm DP. This inequality of measures made the lens would not be centered on the rim, leaving the center thicker (2.4 vs. 2.2) than the previous example and a thickness of 7.4mm time, that is, 32% more thickness than the previous example , leaving about 3mm lens out of the rim. Here comes the famous "Coke-bottle".

In these four examples, we reached the conclusion that a good lens thickness depends on the choice of a frame centered on the user's face. It does not help sell a lens with refractive index 1.67 or 1.74 and offer a frame without centralization. Always remember that refractive index is no guarantee of thin lenses, but the choice of the frame.

In practice this concept can preventive sale, measuring the DP client with pupilometro and thereafter, select frames where the sum over the rim of the bridge is as close as possible to the DP it.

Some optical already follow this model of preventive sale, separating the frames in drawers measured by the bridge over the rim. Thus, simply measuring the DP client and go to the corresponding drawer frames more appropriate.

The second aspect we need to consider is the coherence between the prescription and the refractive index of the lens. 

One of the first things we learn in optics is "the higher the refractive index, the thinner the lenses are." This statement is true only when these lenses are compared on the same diameter, that is, refractive index does miracle in glasses, he is just the complement of a well-chosen frame.

When choosing the right frame, we can choose an index of refraction that is consistent with the prescription presented. Based on my practical experience, I present to you a table that will assist them in choosing the index according to diopters for maximum performance thick.

Many opticians are unsure if surfassagem can make a difference in the thickness of a lens.That depends on the diopter.

If the diopter is positive, surfassagem an index block consistent with the diopter can bring a best result in thickness relative to a lens prepared with the same index. For optimal result thick, use surfassagem in positive income from 2.50 diopters Remember to choose the right frame (bridge + aro equal or very close to the DP). 

If the diopter is negative, surfassagem will not bring differential thickness lens in relation to a purchase of the same index. In the only negative lenses and frame rate make the difference.

The third aspect that may hinder the final thickness of the lens is perfectly fulfilled when the above steps, but the time to write down the measurements of the frame in order, make mistakes in measuring the rim.

The measurements of the ring are crucial in the calculation that will determine the reduction in the diameter of the block surfassagem. If these measures are taken the wrong way, the thickness of the lenses will be compromised.

The Hoya has a fantastic guide that teaches you how to do it correctly measure the frame.Follow the image below it (low resolution). You can also download the pdf file of information with high image quality, just click the following link: http://www.lenteshoya.com.br/optico/downloads/tomadas_de_medida_lifeStyle.pdf

The room is the last aspect that can influence is when the previous customer's glasses with lenses is super thin not because of the choice of frame and content, but by the DNP was set out purposely to reduce the thickness of the assembly.

There are two points to note, since the first is knowing when the client is using a glasses off your DNP. If the customer is using more than a year, he will surprise a glasses again with DNP mounted right because he got used to the prism that was induced by mounting outside the optical center.

Every time we set a glasses off your DNP, the client sees through a prism induced which is calculated by a rule called "Prentice" which is nothing more than the spherical diopter multiplied by decentration assembly (in cm) resulting in prism. Example +3.75 spherical mounted 5mm off the DNP (curved glasses, you know?) Results in Prism 1.88 (+3.75 cm X 0.5 = 1.88). Earlier the customer sees evil, but then he is used to and that is terrible and unacceptable.

Besides being addicted client in a prism glasses mounted with DNP out for the lens becomes thin, it will not have a good result thick if he wants to use the same frame a DNP correct. The best thing to do here is sell a suitable frame and offer a lens with an index consistent with its ametropia. Just as he got used to a DNP wrong this time too it will get used, a DNP right now. This adaptation process can last up to 10 days. After this period the client will be retrofitted.

Except prisms prescribed in revenue, I guarantee you that if you follow all the steps in this regard, the results of the thick lenses of his glasses to their customers will be the best possible technical hassle, simply choose frame centralized index consistent with prescription and proper measurement of the rim to the work order.

Distinguishing marks anti-glare

Distinguishing marks anti-glare

Article written by Paulus Maciel.  Rights Reserved.

Given friend requests, this issue aims to help you, professional optical differentiate the numerous brands of lenses and anti-reflective target the right product to the right customer.

The anti-glare technology is becoming increasingly popular in Brazil and much of this success is due to the commitment of manufacturers to improve the quality of their treatments, thus delivering more confidence to the optical consultant can offer such products to their customers. On the bright side it all ends up causing a bit of confusion in the minds of professional optical, I'm referring to the huge variety of brands of anti-glare available today, ready for both lenses, as lenses for use in surfassadas. For that matter gain a greater objectivity, I work at brand differentiation of anti-glare manufacturers that have the best technology and highest volume of sales of these products, they are: Zeiss, Essilor and Hoya. All products from these manufacturers have at least three basic properties: antirrisco, anti-glare and non-stick. Carl Zeiss Vision offers three technologies in Brazil anti-glare:

• Lotutec
• Easy Care Teflon
• Platinum DuraVision

Of the three brands Zeiss presented above Lotutec is the classic product in the premium range of anti-glare. The strong point of Lotutec is hydrophobic and oleophobic your property that holds lenses clean longer and also facilitates cleaning of the same, when dirty. The key to this efficiency is a raw material of excellent quality, which reduces contact with dirt from the lens.

Lotutec has antirrisco, anti-reflective, hydrophobic and oleophobic where technology stands out most is the cleaning of the lenses (hydrophobic and oleophobic), so during the interview you realize that your client makes much of the lens clean and your budget fits this profile, Lotutec is the perfect family Zeiss.

Easy Care Teflon is a product of strong marketing appeal because the Teflon brand is known worldwide for its non-stick properties and this greatly facilitates the sale of the counter arguments, it comes to a quality brand recognized. 

Easy Care Teflon is as efficient as Lotutec because it has anti-static properties, it is a technology that repels dust, causing Easy Care Teflon remains clean for longer even when compared to ordinary lenses. 

Transparency Easy Care Teflon is as good as it gets Lotutec free of dirt and dust for longer, facilitating the transmission of light, so during the interview you realize that your customer gives much importance to transparent lenses free of dirt and dust for longer and therefore may invest, Easy Care Teflon Zeiss is the ideal option.

DuraVision Platinum is the big news for the anti-glare Zeiss for this year. 

Consumers not only want very demanding lenses clean, but also even more resistant lenses everyday situations, especially for risks. Considering this most demanding consumer, the Zeiss launched its anti-glare tougher DuraVision Platinum.

Duravision Platinum is a perfect product for people who expect maximum performance and durability in their eyeglass lenses, it is the technology that can better balance the high quality of all layers, from the antirrisco, passing by with residual anti-glare blue extremely discreet and also antistatic layers, hydrophobic and oleofóbicas. A product that makes it worth the investment consumers make in their purchase. I suggest reading the material I wrote recently blogged about DuraVision Platinum. It is a good reinforcement of the benefits of the product.

Briefly, we can reach the following conclusion about the antirreflexos Zeiss:

• Lotutec reliable and ideal for those who need lenses clean longer.
• Easy Care Teflon has excellent cost-benefit ratio, it is very effective against dirt, due to its anti-static properties that repel dust and leave the lenses more transparent.
• DuraVision Platinum offers high performance in all technologies employed, since antirrisco up of anti-glare properties and cleaning. Ideal for customers very choosy about the strength and durability of your lenses.

The Hoya three technologies in Brazil offers anti-glare:

• Aqua
• Extra Clean
• No Risk

Aqua is the anti-glare input Hoya.Unfortunately little is known because its manufacture is practically restricted to products surfassados ​​Hoyalab in Rio de Janeiro. The only exception to this rule is the option of launching the new lens ready "Ultrax Trivex Transitions Aqua".

Aqua is a basic product performance, however quality which offers the consumer antirrisco, anti-glare from residual green and nonstick. In short, quality Hoya economy.

Clean Extra is a product of excellent cost-benefit ratio due to its hydrophobic layers and oleofóbicas high efficiency lens that ensures clean for much longer, besides having a residual of green anti-glare very discreet and scratch resistance. Clean Extra is greater than Aqua relative ease of cleaning and resistance to dirt, especially fingerprints.

Extra Clean is anti-glare input line and Miolight Hiperlight.

The best anti-glare Hoya is undoubtedly the No Risk, as well as having all the benefits of Extra Clean, is even more resistant to dirt due to its antistatic layer that repels dust and his excellent treatment antirrisco.It is a product with a price a little higher than other technologies Hoya, but will please a lot of consumers Miolight, Hiperlight Hoyalux and more demanding about the cleanliness and strength of their lenses.

Briefly, we can reach the following conclusion about the antirreflexos Hoya:

• Aqua is an economical choice of anti-glare with higher quality than conventional lenses Ultrax ready, since it has a reflection residual green much more discreet than the very strong blue Ultrax. Aqua is also an economical choice of anti-glare when the product is surfassado Hoyalab in Rio de Janeiro.
• Clean Extra features cost-effective because it has excellent hydrophobic properties and oleofóbicas.
• No Risk is a high performance anti-glare, especially on their properties hidrofóbias, oleofóbicas and antistatic, and excellent resistance to scratches.Customers are more demanding Hoya ideas for lenses with No Risk.

Essilor offers in Brazil three anti-glare technology:

• Crizal Easy
• Crizal Alizé +
• Crizal Forte UV

Crizal Easy is definitely a "Crizal Classic" which has great antirrisco, traditional anti-reflective yellow-green with good hydrophobic layer and water repellency, which according to information from Essilor is 8 times easier to clean than ordinary lenses. It is the economical alternative to Crizal worth Essilor products on offer, it offers more guarantees than "mega base" Optikot who now goes by the name "Trio Easy Clean".

Crizal Alizé + has an excellent cost-benefit ratio because it has properties hidrofóbias, and antistatic oleofóbicas that guarantee, according to the Essilor lenses 10 times easier to clean than an ordinary lens. 

Crizal Forte UV has all the properties of Crizal Alizé + but is higher than the resistance arrranhões because it has a layer that reduces the impact between the hardness and softness risk varnish anti anti glare during dry cleaning lenses. This technology anti impact, called SR Booster makes Crizal Forte UV is 2x more resistant to scratches than Crizal Alizé +. Another difference is the residual reflex that is 30% quieter than previous generations of Crizal.

Crizal Forte UV has UV protection through an added technology applied layers of anti-reflective inner surface, which gives the lens a sun protection factor against UV radiation reflected on this surface. Briefly, we can reach the following conclusion about the antirreflexos Essilor:

• Crizal Easy is an economical choice and higher quality collateral than the Trio Easy Clean, adding more value to the sale of lenses and Essilor Brasilor.
• Crizal Alizé + has a cost-benefit ratio much better because it is more efficient as the ease of cleaning and reduction of dust on the lens surfaces.
• Crizal Forte UV is the ideal option, especially in high value-added lenses from Essilor, because it has a higher efficiency of all its technologies, as well as UV protection, which will please your most demanding consumers.

I love to say that it is not worth comparing the benefits of staying antirreflexos a manufacturer over another, because the technologies mentioned above are applicable only in the manufacturer's own lenses, which takes away the merit of comparing antirreflexos. Vale to penalty differentiate brands from the same manufacturer anti-glare, so you can choose the one that meets your needs.

Another aspect that should be taken into account from the point of view, is the consistency / equity lens prices relative to prices of antirreflexos. The price difference between them can not be small because it will scare the consumer. As much as the optical not see this way, the consumer is a complement anti-glare lens and a "complement" can not cost near equal to or more than the main product but an acceptable percentage. For this reason, the major manufacturers work at least three anti-glare options: economic, intermediate and advanced.

If the consumer is in doubt between one or another anti-glare from the same manufacturer, the tiebreaker will always be the answer you gave this same consumer in history, when the consultant optical ask about the importance that is given to transparency, strength or durability technology presented at the counter.