Optical apparatus for obtaining measurements of portions of the eye
US4019813A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1976 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Jan 19, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/107
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An optical apparatus for obtaining one or more measurements of portions of an eye having means for providing a narrow beam of light through the eye, a lens system that collects light that is reflected from the eye and forms an image on the surface of a television camera tube and including means for determining when the narrow beam of light passes through the center of curvature of the cornea and when the instrument is correctly positioned for proper focus on the eye. Means are connected to the television camera for receiving and processing the video signals while the camera scans the image of the eye for measuring various portions of the eye such as the thickness of the cornea, the curvature of the leading edge of the cornea, the depth of the anterior chamber, the thickness of the lens, the transparency of the cornea, the transparency of the aqueous humor, and the transparency of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.