Simultaneous, wavelength multiplexed vision screener
US6663242B1 · kind B1 · utility
Inventor
Key dates
| Filing date | Mar 12, 2001 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Jun 12, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/103
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A method and apparatus for detecting refractive and non-refractive errors in a patient's eyes is disclosed. The apparatus includes an image-recording device for recording an image of the patient's eyes while illuminated with infrared light and while at least two different meridians of the patient's eyes are simultaneously illuminated with wavelength-encoded visible light. The apparatus further includes a wavelength-encoded light source for illuminating the patient's eyes with infrared light and at least two different meridians of the patient's eyes with wavelength-encoded visible light, and a control system for controlling the image-recording device and the light source. In one embodiment, the image-recording device includes a high-speed digital camera, the wavelength-encoded light source includes a group of infrared light-emitting diodes (LEDs) and a pair of wavelength-encoded flashes located in two different meridians of the camera, and the control system includes a computer system. In an alternative embodiment, the wavelength-encoded flashes are replaced with a wavelength-encoded ring flash.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.