Ophthalmic apparatus with positioning control
US5532772A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1994 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Mar 30, 2014 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/152
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An ophthalmic apparatus for use by an examiner in examining an examinee's eye includes an optical system for examining the examinee's eye, an observing optical path for observing the examinee's eye directly in binocular vision, a beam splitter disposed in the observing optical path, and a mark forming device for forming an aiming mark at a position conjugate to a predetermined portion of the anterior part of the eye, the light of the aiming mark being reflected by the light splitting member into the eyes of the examiner, wherein the positional relationship along the observing optical path between the anterior part of the examinee's eye and the aiming mark is perceived through the examiner's eyes and the suitability of the working distance of the apparatus can be judged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.