Understanding Anti Fatigue Lenses
Article written by Paulus Maciel. Rights Reserved.
A flood of news in spectacle lenses in recent years shook the optical Brazilian market, but with so much information coming in so little time, some great ideas were not absorbed by the professional optical and deserved. Among these ideas are the lenses reducing eyestrain.My goal in this regard is to share my theoretical and practical knowledge about this breakthrough technology in spectacle lenses. I remember that I mentioned my knowledge since I have been a user of this type of lens for more than two years. enough bike When we walk, the muscles in our legs get tired and soon emerge that fatigue symptoms such as pain, for example. The same applies to those who carry weight at work or doing exercise. the "weight" that the muscles of our eyes carry is the effort made during the process of accommodation, that is, every time we need to see by, these muscles move changing the shape of the lens making it more positive to focus on proper distance accessed. It is estimated that this action is repeated muscular average 100,000 times per day. When the action of accommodation is repeated or sustained more than this average arises eyestrain. Symptoms of eyestrain are known clinically as "asthenopia" where the person has pain around the eyes, burning, itchy eyelids, headache and near vision alternating in and out of focus. These symptoms are very similar to other types of visual fatigue that can occur by environmental factors such as air conditioning and pollution. The professional must be aware of refraction during the interview to find out if this is environmental or occupational fatigue, the latter caused by the effort of accommodation. eyestrain caused by the effort of accommodation is present in the lives of people aged between 16 and 40 years, whether they are ametropes whose activities depend heavily on near vision, causing the uncomfortable symptoms listed above.
For decades, this method of reducing fatigue, especially in emmetropia is to prescribe single vision lenses for glasses with +0.50 in both eyes with the recommendation to use only short distances. This is the famous "glasses rest." O "glasses rest" is an economical alternative, however uncomfortable for reducing fatigue, since the person is required to charge the glasses to and fro when seeing this for far addition the puts and takes of his glasses and blurred vision at greater distances. thinking in this niche, the lens manufacturers have developed technology products to reduce eyestrain occupational calls "anti fatigue lenses." anti fatigue lenses produce the required positive diopters only in reducing fatigue on the bottom of lenses (where stress occurs in near vision), leaving a flat upper area of the diopter or away from the user. The use of sunglasses is more comfortable, as it avoids the strip and lay besides ensuring focus at all distances. This technology is similar to multifocal lenses, but instead of additions (1.00 to 3.50) are provided diopters ranging between +0.75 and +0.50 in the lower area of the lens. Despite having similar technology to multifocal lenses, anti fatigue lenses are not addictive in any way non farsighted patients with fatigue, but provide a complete solution to reducing this discomfort for both myopic and hyperopic as to emmetropia. Come to think of a myopic spherical from -1.00 in both eyes using anti fatigue lenses +0.60. When seeing him away, nothing will change, because the correction of -1.00 is in the upper center of the lens, but when you see this shortsighted to close, instead he had seen -1.00 -1.00 + 0.60 = -0.40 diopter. With the reduction of myopia in the lower area of the lens, you have controlled your eyestrain. The nearsighted farsighted sees that it is not very close, so they like to take the glasses to see over shorter distances. With the use of lens anti fatigue, most near-sighted glasses do not take longer to read or lunch, since these lenses automatically reduce the correction of myopia in the lower area thereof. In short, reduced fatigue with maximum comfort.
Now, let's think of a farsighted +1.00 sphere in both eyes using anti fatigue lenses +0.60. When seeing him away, nothing will change, because the correction of +1.00 is higher in the center of the lens, but when it sighted close to see, instead he had seen +1.00 +1.00 + 0.60 = +1.60 diopter. With enhanced correction of hyperopia in the lower area of the lens, you have controlled your eyestrain. The farsighted farsighted is not so good now does not see near, far enough that many change body posture to see over shorter distances.With the use of anti fatigue lenses, most farsighted feel improves body posture to perform various activities, as these lenses automatically reinforce the correction of hyperopia in the bottom of them. In short, reduced fatigue with maximum comfort, also for hyperopia.
Finally we consider a emetrope not farsighted lenses using anti fatigue +0.60. When seeing him away, nothing will change, because it will not fix the upper center area of the lens, but when you see this emetrope to close instead "plan" he had seen plane + 0.60 = +0.60 diopter. With the induction of +0.60 diopters at the bottom of the lens, you will have your eyestrain and controlled with maximum comfort, as it will not be taking and putting the glasses all the time besides having blurred vision at longer distances .Some companies have begun offering in Brazil digital freeform lenses anti fatigue, where the diopter at the bottom of the lens can be +0.75. The option of +0.75 is very welcome for those who have little myopia is almost 40 years old, where lenses +0.60 produce little effect in reducing fatigue. Being freeform, there is the option of using a block to fabricate single vision photochromic lens, which solves the lack of supply of this product in this technology. It would be great if some manufacturer "cutting edge" this lens could work in free form for large scale production. On a large scale, for now only the traditional anti fatigue. Taking Measure for anti fatigue lenses is fairly simple, requiring only the height and pupillary DNP far more measured and type of frame for making the lenses to be surfassadas. Under the commercial point of view, reducing fatigue lenses are excellent value-added products, because the "package" sold best frames (you will get all the time with the glasses) and also premium anti-reflective treatment with greater scratch resistance and dirt.
A flood of news in spectacle lenses in recent years shook the optical Brazilian market, but with so much information coming in so little time, some great ideas were not absorbed by the professional optical and deserved. Among these ideas are the lenses reducing eyestrain.My goal in this regard is to share my theoretical and practical knowledge about this breakthrough technology in spectacle lenses. I remember that I mentioned my knowledge since I have been a user of this type of lens for more than two years. enough bike When we walk, the muscles in our legs get tired and soon emerge that fatigue symptoms such as pain, for example. The same applies to those who carry weight at work or doing exercise. the "weight" that the muscles of our eyes carry is the effort made during the process of accommodation, that is, every time we need to see by, these muscles move changing the shape of the lens making it more positive to focus on proper distance accessed. It is estimated that this action is repeated muscular average 100,000 times per day. When the action of accommodation is repeated or sustained more than this average arises eyestrain. Symptoms of eyestrain are known clinically as "asthenopia" where the person has pain around the eyes, burning, itchy eyelids, headache and near vision alternating in and out of focus. These symptoms are very similar to other types of visual fatigue that can occur by environmental factors such as air conditioning and pollution. The professional must be aware of refraction during the interview to find out if this is environmental or occupational fatigue, the latter caused by the effort of accommodation. eyestrain caused by the effort of accommodation is present in the lives of people aged between 16 and 40 years, whether they are ametropes whose activities depend heavily on near vision, causing the uncomfortable symptoms listed above.
Now, let's think of a farsighted +1.00 sphere in both eyes using anti fatigue lenses +0.60. When seeing him away, nothing will change, because the correction of +1.00 is higher in the center of the lens, but when it sighted close to see, instead he had seen +1.00 +1.00 + 0.60 = +1.60 diopter. With enhanced correction of hyperopia in the lower area of the lens, you have controlled your eyestrain. The farsighted farsighted is not so good now does not see near, far enough that many change body posture to see over shorter distances.With the use of anti fatigue lenses, most farsighted feel improves body posture to perform various activities, as these lenses automatically reinforce the correction of hyperopia in the bottom of them. In short, reduced fatigue with maximum comfort, also for hyperopia.
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