Automatic interpupillary distance measuring device
US4881806A · kind A · utility
3Cited by
1References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Jul 26, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/111
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
To measure automatically a distance related to the interpupillary distance of a person, a light source generates a corneal reflection on at least one eye of the person. By means of a scanning system such as a rotating mirror, a sensor receiver is scanned transversely to the general direction of observation of the person to direct light rays from the corneal reflection or reflections onto the sensor receiver in which is a measurement reference mark relative to which the corneal reflection or reflections is or are located.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.