What is Low Vision? Low Vision indicates a vision of less than 6/18 but more than 3/60 or field of vision reduced to 20 deg. or less. People having Low Vision are termed as `partially… Affordable low vision devices withplastic aspheric lenses.

What is an ASPHERIC: Aspheric surface implies a non-spherical (viz: conic) surface with rotational symmetry about its optical axis. The Aspheric surface profile can be represented by a mathematical relation between its sag and aperture… What-Why-Where of Aspherics?