Apparatus and method for testing the motion contrast visual sensitivity of an individual
US4789234A · kind A · utility
19Cited by
7References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1987 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Jan 2, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/161
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The motion contrast visual sensitivity of an individual is tested by means of a target having thereon patches each composed of alternating light and dark bars, with individual patches varying in contrast and spatial frequency, and also in orientation. The target is viewed by way of a slot through a housing positioned in front of the individual under test, and a shutter rotating within the housing at a controlled speed periodically blocks the slot at a rate sufficiently slow, e.g. 30 cycles per second, for the observer to detect the resulting conditions of flicker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.