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The preferred lens option for prescription glasses
-Aspheric lenses
As is known to all that, prescription glasses have become very popular among the people who suffer different eye problems, such as myopia, presbyopia, astigmatism and so on. And the lens options for these prescription glasses are almost available in many materials, such as glasses, polycarbonate, high index, photochromic and so on.
Now the appearance of a new kind of lenses has attracted many people’s attention and become more and more popular. Compared with other lenses, what are the actually disadvantages for the aspheric prescription glasses? Here we would like to explain for you.
We know that the surface of conventional lenses represent spherical which means that the curve across its entire surface is almost the same, just like the ball. Just as its name implies, the surface for aspheric lenses is aspheric, that is to say that it have a more complex front surface that gradually changes in curvature from the center of the lens out to the edge. With the development of the advanced optical design technology, some of the aspheric lenses can even be made with flatter curve which shows a more attractive profile.
Further more, almost most aspheric lenses for prescription glasses are high index which will make the glasses thinner compared with standard lenses under the same prescription. So the combination for the high index and aspheric surface design makes the lenses noticeably slimmer, thinner and lighter. And this effect will be especially noticeable for prescription glasses with high degree presbyopia which is very thick at the center, and thinner at their edge. Since the surface for the aspheric prescription glasses are more plano, the bulging of the lenses from the frame will be reduced a lot and your glasses will look thinner and slimmer.
For conversational lenses, if you gaze your attention at one direction (except the center) such as the left or the right, the lenses will cause distortion which will directly lead to the discomfort for your eyes. Now with the help of such aspheric prescription glasses, the above phenomenon has reduced to a great extent since it provides a wider field of view and better peripheral vision.
To sum up, with the above benefits we get from aspheric prescription lenses, you will find the outside world looks more natural and more beautiful since the distortion around your eyes have greatly reduced. |
