Patent · US Active

Method and apparatus for measuring add power of a contact lens

US10509237B2 · kind B2 · utility

0Cited by

0References

13Claims

0Family size

Assignee

COOPERVISION INTERNATIONAL LIMITED · GB

Inventors

Daozhi Wang · Dublin, US
Laura Horan · Radolfzell, DE

Key dates

Filing date	Apr 20, 2018
Grant date	Dec 17, 2019
Priority date	—
Expiry date	Jul 24, 2038

Classification

Technology area (CPC G)Physics
CPC primaryG02C2202/22
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A contact lens has a central region and an annular region surrounding the central region, the central region having a first optical power and the annular region having a second optical power. In a method of measuring the add power, the wavefront aberration of the contact lens is measured; a polynomial is fitted to the measured wavefront aberration. Terms of the polynomial correspond to types of aberration comprising defocus and astigmatism and residual aberrations. The add power is calculated as a defocus corresponding to the residual aberrations.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.