Eye test apparatus with physician routed patient input adjustment to variable optical elements
US4015899A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1975 |
| Grant date | Apr 5, 1977 |
| Priority date | — |
| Expiry date | Oct 22, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B3/028
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Corrective optics having continuously variable spherical, astigmatic, and prismatic functions are placed in a light path between a viewing patient and a projected target. Typically, the target is projected by a projector preferably through focusing optics in the form of a field mirror. The focusing optics serve the dual purpose of relaying to the patient the image of the target as well as focusing to the patient's eyeglass position a real image of the corrective optics. A patient has a patient input, typically a hand wheel, at or near his patient viewing station. The patient uses this input to vary the setting of the corrective optics. The eye examiner, at an adjacent eye examination station, is provided with a gear box having a clutch mechanism. The gear box includes examiner inputs for astigmatic and spherical correction to each eye as well as prismatic correction for both eyes. Through use of the clutch mechanism, the patient input at the patient viewing station can be routed individually or collectively to the various spherical, astigmatic, and prismatic corrections for either or both eyes. By utilizing specialized aligned targets and following simplified examiner instructions,…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.