Apparatus for testing dark adaptation
US5080478A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1989 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Sep 19, 2009 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/063
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Apparatus for testing dark adaptation comprises a test panel. Four test stimuli, comprising arrays of light emitting diodes, are arranged on the test panel around a fixation light emitting diode. Translucent covers are mounted over the arrays of light emitting diodes. Four switches to enable a subject to input the identity of a visible test stimulus are provided, each switch is operated by a button formed by a respective cover of the test stimuli. A test stimulus is randomly selected and switched on at a predetermined level of luminance. On a correct identification, another test stimulus is selected and switched on at a reduced level of luminance. The times from the commencement of the test until the various correct identifications are recorded, as are the corresponding level of luminance of the test stimuli.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.