US 2015/0029460 A1 · MULTIFOCAL CORRECTION PROVIDING IMPROVED QUALITY OF VISION

Abstract

This invention describes strategies and devices for improving the visual experience while expanding the depth of field of presbyopic and pseudophakic patients. The invention describes strategies and devices for providing improved image quality and improved visual quality of patients employing simultaneous vision bifocal, trifocal or multifocal corrections or monovision. The invention describes strategies and devices for reducing the visibility of the defocused part of the retinal image generated by simultaneous vision bifocal and multifocal ophthalmic corrections and monovision. The invention describes strategies and devices that employ control of spherical aberration or other similar asphericities to reduce the visibility of defocused ghost images. The invention describes strategies and devices that ensure that negative defocus is always coupled with negative spherical aberration (or similar asphericity), and that positive defocus is always coupled with positive SA (or similar asphericity) as a means to reduce the visibility of defocused ghostimages.

Claims19

Dependent claims

A multifocal diffractive ophthalmic lens, comprising:

a base optic adapted to change the power of user's eye, the base optic having an anterior surface and a posterior surface;
and
a diffractive element on at least one of the anterior surface and the posterior surface, the diffractive element providing at least one of a distance power and a near power, wherein the base optic is configured to produce a negative spherical aberration for the distance power and the diffractive element is configured to produce a positive spherical aberration for the near power.

Dependencies are inferred from the claim text.

Multifocal correction providing improved quality of vision

Life of this patent

Multifocal correction providing improved quality of vision

Life of this patent

Abstract

Claims19