Stereoscopic retinal camera with focus detection system
US5382988A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 23, 1993 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Jul 23, 2013 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/132
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A stereoscopic retinal camera is provided with an illumination optical system for illuminating the fundus of an examinee's eye, an observing/photographing optical system for observing and photographing an image of the fundus of the eye in a stereoscopic picture, which includes a light beam splitting optical system for splitting the light beam of the illumination optical system reflected by the fundus into a right light beam and a left light beam and a pair of image forming optical systems for forming respective images of the fundus by the two light beams, an index projecting optical system for projecting a focusing index on the examinee's eye, an index detecting optical system for detecting the focusing condition of the focusing index projected on the fundus of the eye, a judging means for judging a focusing condition by processing signals provided by the index detecting optical system, wherein one of the index projecting optical system and the index detecting optical system comprises a pair of right and left optical systems, which are disposed on each light path branched from light paths of the image forming optical systems, and use a part of the light path of the image forming op…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.