Glare tester
AssigneeLeica Inc.
InventorBernard Grolman
Life of this patent
Estimating the term…
Abstract
A glare tester suitable for use with conventional subjective refractors for testing visual acuity is disclosed. The tester may be fitted to new refractors or retrofitted to existing refractors. The preferred tester is a plastic annular ring with a plurality of LEDs mounted in recesses to direct light toward the test axis and a surface to reflect the LED light toward the patient's eye. A coating on the ring surface opposite the patient's eye improves the LED efficiency.
Claims20
A refractor for glare testing an eye comprising, a refractor body, a testing axis passing through said eye and body a wheel located in said body and adapted for rotation therein, an aperture positioned in said wheel and selectively positionable on said testing axis, means for subjecting said eye to glare by inundating said eye with visible illumination when said aperture is positioned on said axis, whereby the acuity of said eye may be tested with and without glare or the time for recovery of acuity after glare can be determined.
A refractor for testing an eye having a visual axis comprising, means for positioning a selected one of a plurality of corrective lenses on said visual axis and means for selectively subjecting said eye to glare by visible illumination along said visual axis, whereby the acuity of said eye may be tested with and without glare.
A refractor for testing visual acuity along a test axis comprising, a plurality of wheels rotatable about a rotation axis, each of said plurality of wheels having a plurality of apertures selectively positionable on said test axis, one of said wheels having a plurality of corrective lenses mounted thereon for positioning a selected lens and aperture on said test axis, one of said wheels having means for selectively subjecting said eye to glare by visible illumination along said test axis, whereby the acuity of said eye may be tested with and without glare.
An accessory for a refractor having an auxiliary wheel containing an opening adapted to be selectively placed on a test axis of said refractor which comprises:
- an annular plastic ring having a pair of opposed planar surfaces, each of said pair having an inner and an outer diameter, one of said pair having an inner diameter greater than the inner diameter of the other of said pair, a peripheral surface, a plurality of recesses spaced around said peripheral surface, a plurality of LEDs, each of said plurality of LEDs being mounted in a respective one of said plurality of recesses, means to selectively activate said LEDs, and mounting means for holding said one of said pair of surfaces against said wheel axially aligned with said opening.
Dependencies are inferred from the claim text.