Binocular ophthalmoscope
US4449797A · kind A · utility
Inventors
Key dates
| Filing date | May 19, 1981 |
| Grant date | May 22, 1984 |
| Priority date | — |
| Expiry date | May 19, 2001 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/132
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In a binocular ophthalmoscope for indirect observation of an eye to be examined, having an observation unit and an illumination unit connected to the observation unit, wherein the observation unit deflects two closely spaced converging observation beams defining an observation plane with two first and two second mirrors to increase the beam spacing to the interpupillary distance of the observer's eyes. The two first mirrors are mounted closely together between the two second mirrors in a wedge and wherein the illumination unit includes a light source and a third mirror at the emergent side thereof which directs the light issuing from said light source along an illumination beam to the eye to be examined. The first two mirrors are mutually displaceable within the observation unit in the observation plane towards and away from the eyes of the observer to vary the convergence angle of the observation beams and the illumination beam is movable towards and away from said observation plane to vary the angle of the illumination beam with respect thereto.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.