Abstract

In recent years a miscellany of axially symmetric, varifocal, simultaneous-vision, soft contact lenses has been produced in an attempt to give presbyopes adequate vision over a range of object distances^1-4. Although details of the individual designs vary, all use at least one aspheric surface to give a smooth variation in power from the centre to the edge of the optic zone of the lens.

© 1993 Optical Society of America