Complete autorefractor system in an ultra-compact package
US7481535B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2004 |
| Grant date | Jan 27, 2009 |
| Priority date | — |
| Expiry date | Aug 30, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/156
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An autorefractor system in an ultra-compact package is described for rapidly and objectively measuring the refractive state of the eye. The autorefractor detector system, in conjunction with a secondary light source, uses one photodetector such as a charge coupled device (“CCD”) or one photodiode, to intercept a light beam at two distances from a secondary retinal light source created by one relay lens, one pupil emitter conjugate lens and one pupil detector conjugate lens, as well as a field lens. The signals produced by the photodetector are used to determine the full spherocylindrical refraction of the eye. A novel illumination and imaging system provides multiple capabilities to image the eye, control accommodation, and acquire and maintain optical alignment, while obtaining other measurements of the eye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.