Test disk for eye examination
AssigneeOptische Werke G. Rodenstock
InventorsOtwald Teichner, Manfred Born
Life of this patent
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Abstract
An exchangeable device providing test patterns for eye examinations is provided to be insertable into an eye examination instrument, such as a projector or an eyepiece instrument. This device includes a cassette containing a rotatable disk carrying different test patterns with the test patterns being visible through light transparent portions of the cassette. The cassette is insertable into the instrument, and the test pattern is illuminated through the light transparent portions with the disk being rotated through coupling elements connected to a drive mechanism of the instrument to vary the test pattern.
Claims10
An exchangeable test pattern device for ophthalmological examination instruments comprising
- a cassette housing for insertion into an ophthalmological examination instrument, said cassette housing including at least one transparent portion,
- a disk rotatably mounted in said cassette housing, said disk including a plurality of test patterns, each of said test patterns being selectively visible at said transparent portion, and
- means for rotating said disk.
Dependencies are inferred from the claim text.