Apparatus and method for measuring subjective ocular refraction with high-resolution spherical and/or cylindrical optical power
US11659989B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2017 |
| Grant date | May 30, 2023 |
| Priority date | — |
| Expiry date | Aug 2, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/0081
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Disclosed is an apparatus for measuring subjective ocular refraction including a display device configured to display a least one optotype and a refractive optical system arranged between an eye of a viewer and the display device, the refractive optical system having an optical power that can be varied according to a determined minimum step. The display device further includes a unit for varying optical power designed to generate a variation in the spherical and/or cylindrical optical power, such that the display device and the refractive optical system form a first image of the optotype with a first total optical power and, respectively, a second image of the optotype with a second total optical power, the variation in optical power between the first total optical power and the second total optical power being less than the determined minimum step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.