TH12945A - Multiple focal length, multi-field diffraction lens - Google Patents

Abstract

Several focal length lenses for eye improvement have been revealed. This invention uses at least one diffraction zone, placed in a defined part of the refraction lens surface to achieve a multi-focal length vision that is achieved by providing Near 100% efficiency in a +1 diffraction rating, this revealed lens may be used for both contact lenses and intraocular lenses, as well as other diopter adjustment applications.

Claims (1)

1. A multi-focal length lens for diopter correction, consisting of a basic lens element with fundamental lens power and focal length, and one or more diffraction elements. Covers one or more districts And which has diffraction power, where part of the light passing through the lens is Focus at the aforementioned fundamental focal lengths, by the power of the aforementioned lens, and the other part of the light passing through it, being focused at a different focal length by the assembly of the basic lens elements; and Such diffraction piece (tag: