Ophthalmologic instrument
US5614966A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1995 |
| Grant date | Mar 25, 1997 |
| Priority date | — |
| Expiry date | Oct 26, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/165
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In order to detect an alignment state while watching an index image, illumination light is first projected onto an anterior segment of a subject's eye (E) from LEDs (21), and then light emitted by another LED (31) is guided to a cornea (C) through an alignment light projecting optical system (30). The light emitted by the LEDs (21, 31) and reflected by the subject's eye (E) is imaged on a CCD camera (26) through an image-formation optical system (20). An index image (SP) and an anterior segment image (E') which are of the reflection light guided to the CCD camera (26) are displayed on a screen (28). The index image (SP) is received by a sensor (46). Based on information about received light obtained by the sensor (46), a comparator (47) detects information about alignment of the subject's eye (E) with an instrument body. According to a detection result obtained by the comparator (47), a display state of the display (28) is changed, so that an operator judges that a desired state of alignment is nearing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.