Method and graphic to achieve optimal lens correction for subnormal vision due to impaired retinas and undeveloped defective focusing abilities
US4747682A · kind A · utility
Inventor
Key dates
| Filing date | Dec 5, 1983 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Dec 5, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/02
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Patients suffering severe retinal damage and focusing impairment are tested in an area having actual or simulated outdoor illumination by viewing a graphic having colored familiar objects and letters of graduated incremental sizes thereon with colored backgrounds either darker or lighter than the objects and letters involved to ascertain the patient's estimated optimal correction for distance vision. Based on said estimate, the patient is provided with a combination of a soft contact lens between the estimated correction and a correction obtained by traditional testing methods using black letters against a white background in a darkened room, and a plurality of spectacle type lenses in incremental diopter corrections of two or three diopters for training purposes. The patient trains for about twelve weeks using such combination indoors and outdoors whereby the soft contact lenses are worn and the patient views successively through different diopter lenses to improve focusing ability and perception and to arrive at a final optimal correction for soft contact lenses and further spectacle type lenses to be used for reading. During the latter period the patient receives supportive ther…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.