Eye fundus plethysmograph assembly
US4157708A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1976 |
| Grant date | Jun 12, 1979 |
| Priority date | — |
| Expiry date | Oct 22, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/12
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An eye fundus plethysmograph assembly is provided for determining variations in the amount of blood present at the fundus of the eye. A source of at least a first and second wavelength of light energy is specifically directed into a subject eye for reflection from the retina or fundus of the eye. The reflected light is directed at a receiving element that can produce a first output signal representative of a reflected first wavelength and a second output signal representative of a reflected second wavelength. A processing circuit is provided for subtracting one of the first and second output signals from the other to provide a representative measurement output of the amount of blood in the blood vessels adjacent the eye fundus. The output signals can be recorded or displayed in any desired form to facilitate the interpretation of the amount of blood present.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.