Regular lenses have the same curves across its entiresurface and a front surface that is spherical (much like a circle in theshape).
Aspheric lenses have a more unique front surface(more like ashape of an oval)that gradually changes in its curvature from the center of thelens out to the edge.
An Aspheric lens provides a thinner profile for allprescriptions. But the difference really takes place in the plus lenses, whichare thicker in there center than at the edge.
The stronger the prescription, the more the center of the lens bulges forward from the frame.
An Aspheric lens has much thinner curves, so there is lessbulging of the lens from the frame.
This effect gives the eyewear a more flattering and slimmerprofile.
Even though the effect of the aspheric lens is lessnoticeable on the minus powers it provides a significant reduction in the edgethickness compared with regular lenses.
Aspheric design makes it possible for someone who has astrong prescription to wear a larger selection of frames without worrying ofthe lenses being to big.
Less peripheral distortion
The way regularlenses designed ,a distortion is createdwhen the eyewear is looking away from the center of the lens, whether you lookdirectly to the left or right.
Aspheric lenses unique design eliminates completely orreduces these distortions for a better peripheral vision.
Regular spherical lenses with a strong (-)or(+) causeunwanted minimization or magnification of the eye.this makes objects appesrlarger and closer ( ) or smaller and farther (-) then they actually are.
Spherical (+) lenses will give the wearers eyes anunnaturally magnified ”bug -eyed” look, spherical (-) lenses will make eyeslook smaller, “beady-eyed” appearance.
Aspheric lenses In high (+)power actually reduces this magnification effect.
The eye on the left seen thru Aspheric lens and the eye onthe right thru a regular spherical lens, booth the same power.
Aspheric lens significantly reduce the magnification and minimization effects so the world looks better to you and you look better to the world.
Notice: Aspheric lenses are positioned slightly closer to the face and are flatter then conventional lenses, also most Aspheric lenses are high index lenses and naturally cause more reflections of the front and the back of the lens for this reason it is highly recommended for Anti Reflective coating AR HMC.