Fixation card attachment for retinoscope
US5202710A · kind A · utility
23Cited by
1References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1991 |
| Grant date | Apr 13, 1993 |
| Priority date | — |
| Expiry date | Sep 11, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F7/04
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A fixation card attachment for an eye examination instrument that enables the card to be positioned in reference to the optical path of the instrument so that the patient undergoing examination must refocus his or her eye when reading indicia on the card. The card is secured to the instrument by use of a magnetic coupling. The magnetic coupling includes a permanent magnet encapsulated in the front face of the examination instrument and a magnetic strip provided on the back of the fixation card.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.