Aspheric lenses have surfaces which do not resemble segments of a sphere or cylinder. Instead, aspheric lenses ha ve a profile that changes in curvature across the surface. This type of lens is ...

Aspheric lenses have at least one surface that is not a true sphere. The aspheric profile used is frequently a conic surface of revolution about the lens axis, matched in design to the shape of the ...

Aspheric mirrors cannot be produced using the same bulk production methods used for spherical mirrors, hence the higher cost. Aspheres are sometimes produced using precision molding techniques. These ...

A spherical surface is defined by only one parameter, the radius or curvature of the surface. If the surface is refractive, with different indices of refraction before and after the surface, then the ...

The HumanOptics Torica-s is available from 2 to 12-D in 1-D increments. † As of December 2010. IOL: Intraocular lens. Residual postoperative corneal astigmatism is an important cause of poor ...