Most aspheric lenses also are high-index lenses. The combination of an aspheric design with high-index lens materials creates a lens that is noticeably slimmer, thinner and lighter than conventional glass or plastic lenses.
Whether you are nearsighted or farsighted, aspheric lenses are thinner and lighter and have a slimmer profile than ordinary lenses.
Aspheric lenses have a slimmer profile for virtually all prescriptions, but the difference is especially dramatic in lenses that correct high amounts of farsightedness. Lenses that correct farsightedness (convex or "plus" lenses) are thicker in the center and thinner at their edge. The stronger the prescription, the more the center of the lens bulges forward from the frame.
Aspheric plus lenses can be made with much flatter curves, so there is less bulging of the lens from the frame. This gives the eyewear a slimmer, more flattering profile.
It also makes it possible for someone with a strong prescription to wear a larger selection of frames without worry of the lenses being too thick.
Eyeglass lenses that correct myopia (concave or “minus” lenses) have the opposite shape: they are thinnest at the center and thickest at the edge.
Though the slimming effect of an aspheric design is less dramatic in minus lenses, it still provides a noticeable reduction in edge thickness compared with conventional lenses for myopia correction.
A More Natural View Of The World
With conventional lens designs, some distortion is created when you look away from the center of the lens — whether your gaze is directed to the left or right, above or below.
Conventional spherical lenses with a strong prescription for farsightedness cause unwanted magnification. This makes objects appear larger and closer than they actually are.
Aspheric lens designs, on the other hand, reduce or eliminate this distortion, creating a wider field of view and better peripheral vision. This wider zone of clear imaging is why expensive camera lenses have aspheric designs.
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