Method for displaying a photographing point of a cornea in an apparatus for obtaining video images of corneal cells
US5757461A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1996 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Apr 22, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/145
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method for displaying a photographing point of a cornea which is used in an apparatus for obtaining video images of corneal cells. The apparatus includes (a) first optical assembly having a video camera provided in front of a subject eye for observing and obtaining video images of a frontal portion of the subject eye, (b) second optical assembly for projecting slit light to an eyeball surface of the subject eye, and (c) third optical assembly for magnifying a video image of a subject portion of the eye produced based of a projection of the slit light by the second optical assembly and for guiding the image to the video camera so that the magnified video image of the subject portion of the eye is photographed by the video camera; and the displaying method comprises the steps of (i) determining a first coordinate with respect to the video image of the frontal portion of the subject eye, which corresponds to the subject portion of the eye photographed, (ii) determining a second coordinate, which corresponds to a pupil center in the video image of the frontal portion of the subject eye; and (iii) marking and displaying the photographing point of the cornea in the video image of the f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.