Method and apparatus for measuring refractive errors of an eye
US6382795B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | May 20, 2000 |
| Grant date | May 7, 2002 |
| Priority date | — |
| Expiry date | May 20, 2020 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/14
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Embodiments of the present invention advantageously satisfy the above-identified need in the art, and provide method and apparatus for measuring refractive errors of an eye that improve upon wavefront type refractors using a conventional Hartmann-Shack sensor. Specifically, one embodiment of the present invention is an apparatus for measuring refractive errors of an eye which includes: (a) a source of a probe beam; (b) a first Badal lens system adapted to project the probe beam into a subject's eye to form an illumination spot on a retina; (c) a second Badal lens system adapted to image the illumination spot onto an image plane substantially conjugate to the retina; and (d) a spatial filter disposed in the image plane adapted to transmit at least a portion of the image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.