Contrast chart device, contrast sensitivity measuring device and contrast sensitivity measuring method
US7441900B2 · kind B2 · utility
24Cited by
8References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2002 |
| Grant date | Oct 28, 2008 |
| Priority date | — |
| Expiry date | Feb 23, 2024 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/112
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A contrast chart device of the present invention comprises a contrast target presenting part for presenting a contrast target for a contrast sensitivity test at prescribed timing; a pupil data measuring part for producing an image of an anterior ocular segment of a subject and measuring the diameter or area of a pupil region in the anterior ocular segment; and a measurement timing forming part for forming timing at which the pupil data measuring part performs measurement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.