Ophthalmic apparatus
US5684562A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1995 |
| Grant date | Nov 4, 1997 |
| Priority date | — |
| Expiry date | Dec 12, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/107
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An ophthalmic apparatus for measuring the shape of the cornea of the eye, capable of measuring the pupil in a natural state of vision is provided. An illuminating light source illuminates a cornea shape measuring pattern with red or infrared light to project an image of the cornea shape measuring pattern on the cornea of the eye, and a CCD camera picks up the image of the cornea shape measuring pattern formed on the cornea. A computer analyzes the image of the cornea shape measuring pattern to obtain data of the shape of the cornea and processes the data to calculate the regional curvatures of regions of the cornea. An intraocular illuminating light source illuminates the interior of the eye with red or infrared light, and the CCD camera picks up an image of a pupillary region illuminated by the light emitted by the intraocular illuminating light source and reflected by the interior of the eye. The computer analyzes the image of the pupillary region to obtain the data of the pupillary region and processes the data to determine the shape or the size of the pupil in a natural state of vision.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.