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An aspheric lens is a type of eyeglass lens that has a more complex and advanced surface design. A standard lens has a simple, round curve, as if it were sliced from a ball. An aspheric lens has a flatter curve that gradually changes from the center to the edge. This smart design helps to improve both how you see and how your glasses look.
read more about aspheric lens ...Standard (spherical) lenses can cause distortion, especially at the edges. This happens because the simple curve bends light differently at the edges than it does in the center. This can make your vision blurry when you look away from the center. The special, changing curve of an aspheric lens corrects this problem. It focuses all the light to a single point, giving you a wider field of clear, sharp vision.
The main benefit of an aspheric lens is clearer vision with less distortion. Because of their flatter design, they can also be made much thinner and lighter than standard lenses. This makes them more comfortable to wear. The flatter profile also reduces the "bug-eye" or "minified-eye" look that can happen with strong prescriptions, so your eyes look more natural behind the lenses.
Aspheric lenses are especially helpful for people with strong prescriptions for farsightedness or nearsightedness. The higher the prescription, the more you will notice the benefits of a thinner, lighter, and less distorted lens. However, even people with mild prescriptions can enjoy the improved visual clarity and better appearance that aspheric lenses provide.
While aspheric lenses offer superior optics, they are less forgiving than standard lenses if they are not fitted perfectly. Because the curve changes across the surface, the optical center of the lens must be placed exactly in front of your pupil. If the lens sits too high or too low on your face, you may actually experience more blur and distortion than with a regular lens. This makes professional measurement of your "ocular center height" critical for these lenses.
Yes, they usually cost more than standard spherical lenses. The design is more complex, which makes them more difficult to manufacture.
You usually cannot tell just by looking at them. Your optician can tell you what kind of lenses you have from your order. It is an option you choose when you buy your glasses.
Most people adapt to aspheric lenses very quickly because they provide better vision. Like with any new pair of glasses, you might have a brief adjustment period as your eyes get used to them.
When you are buying new glasses, you should ask your optician if an aspheric lens design is a good option for you. They can show you the difference it will make for your specific prescription. For people with strong prescriptions, the improvement in comfort and appearance can be very significant.
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