Retinal flux density meter and method of use
US7258438B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2004 |
| Grant date | Aug 21, 2007 |
| Priority date | — |
| Expiry date | Jan 28, 2026 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/12
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A system for approximating flux density of light on a human retina. A housing has an opening allowing light to pass to inside the housing. A baffle coupled to the housing replicates a facial cutoff function response for the light inside the housing. Two detectors are positioned to detect the light inside the housing. One detector produces a photopic spectral response function of the light inside the housing that approximately replicates a spectral response of the foveal cones in the retina. Another detector produces a scotopic spectral response function of the light inside the housing that approximately replicates a spectral response of rods in the retina. A processor coupled to the detectors calculates a mesopic flux density of the light inside the housing based on the photopic and scotopic spectral response functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.