Indicating an asphericity of the cornea of an eye
US4046463A · kind A · utility
20Cited by
5References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1974 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Jul 17, 1994 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/107
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circular array of twelve light sources transmit light to an eye. A spherical shape of the cornea of the eye is indicated when light reflected therefrom appears to be transmitted from twelve virtual light sources disposed along a circular path within the eye. Correspondingly, an aspherical shape of the cornea is indicated when the virtual sources appear to be disposed along an acircular path within the eye. The array may be disposed within a light reflecting groove which collects ambient light which is transmitted to the eye. A reflection of the collected light appears to be a ring of light which connects the virtual sources.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.