Cupola-type ophthalmological apparatus the visual field and the electrophysiological examination of the human eye
US4626090A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1984 |
| Grant date | Dec 2, 1986 |
| Priority date | — |
| Expiry date | Apr 16, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/024
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
This invention relates to a cupola-type visual stimulation ophthalmological pparatus for examining the visual field of a patient and performing electrophysiological examinations. It comprises a projection screen consisting of the inner surface of a hemispherical cupola, the patient's eye being disposed centrally of the cupola during the examination. A device for projecting visual stimuli on the screen is provided in the upper portion of the cupola and comprises essentially a casing incorporating a light source, filter means, an object mask, a lens and a movable reflecting mirror located in the vicinity of the cupola center. This mirror is adapted to project toward any desired point of the screen a luminous stimulus perceived by the patient for measuring the extent of the patient's visual field. Moreover, with the projection device it is possible to illuminate the complete visual field according to criteria relating specifically to electrophysiological examinations. For this purpose, the casing comprises a window adapted to be masked for examining the visual field and to be opened for making electrophysiological examinations, the light rays from the light source being deflected thro…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.