Method and apparatus for perimetry
US5114222A · kind A · utility
20Cited by
6References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 11, 1989 |
| Grant date | May 19, 1992 |
| Priority date | — |
| Expiry date | Dec 11, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/112
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A perimetry system uses pupillary light response to a small bright light spot or other suitable stimulus which moves at a constant speed in generally a circular path centered on a fixation mark upon which the patient's field of view is fixed. The pattern traced by the spot may be a spiral, starting at the periphery and shrinking toward the fixation mark. A measuring system continuously monitors pupil size and if the retinal image of the moving light spot moves across a region of reduced sensitivity, this event is signaled by a change in pupil size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.