Intraocular lens having an extended depth of focus
US10531950B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 2017 |
| Grant date | Jan 14, 2020 |
| Priority date | — |
| Expiry date | Oct 28, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/20
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An intraocular lens, comprising an optic having an anterior surface and a posterior surface, providing a refractive base power, at least one of the anterior surface and the posterior surface having disposed thereon a profile comprising steps having heights determined by combining three constituent diffractive profiles. The diffractive profiles correspond to powers p1, p2 and p3, the powers being different than one another and each power being a positive power less than about 1D or about 1.25D. Each of the diffractive profiles having step heights causing a phase delay, relative to aqueous fluid, of 0.6 to 1.2 times 2π for 546 nm light. The combined profile defined by the function: z=max (diffractive profile (p1), diffractive profile (p2), diffractive profile (p3)), where p3>p2>p1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.