Back projection visual field tester
US6729728B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 2002 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Jun 12, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/024
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
One embodiment of the present invention is a visual field tester that includes: (a) a projection screen; (b) a stimulus projection system that projects a light stimulus onto a first side of the projection screen; and (c) a background projection system that projects background light onto the first side of the projection screen; wherein the stimulus projection system includes: (i) a first rotatable disk having an aperture; (ii) a second rotatable disk disposed in the aperture; and (iii) a stimulus radiation projector that includes a stimulus radiation source and a radiation projection lens system that are configured to project the stimulus from the second disk onto the first side of the projection screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.