Air puff type tonometer
US5042484A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1988 |
| Grant date | Aug 27, 1991 |
| Priority date | — |
| Expiry date | Oct 13, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/165
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An air puff type tonometer having a source for projecting a light beam toward the cornea of an eye to be tested, an alignment sensor for receiving the light beam after reflection from the cornea and providing a corresponding received light signal, a device for detecting optical alignment based on the received light signal, a device for directing an air puff, a device for providing an applanation signal corresponding to the applanation state of the cornea when the cornea is applanated by an air puff upon the cornea, an A/D converter for converting the applanation signal in accordance with a preset comparison reference value, and a device for setting the comparison reference value based on quantity of light received by the alignment sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.