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US 4,045,130 AGranted
Apparatus for the perimetric testing of the visual field of the human eye
AssigneeOptische Werke G. Rodenstock
InventorWilhelm Krahn
Life of this patent
Estimating the term…
Abstract
A perimetric testing apparatus is described for use in testing the field of vision of human eyes. This apparatus includes an approximately hemispherical shell together with a device for projecting successive light pattern groups onto the inner surface of the shell. The device includes shadow masks, representative of different light pattern groups, which may be selectively inserted into the light path of a light source projector. The apparatus may be used in a dynamic perimeter.
Claims20
An apparatus for perimetric testing of the field of vision of eyes comprising:
- an approximately hemipherical shell;
- and
- means for successively projecting selected individual ones of a plurality of patterns of light spots wherein each of said patterns comprise a plurality of light spots on the inner surface of said hemispherical shell at an angle corresponding to the visual field of the eye to be tested, said projecting means including means for controlling the light spots of each pattern as to brightness of position, size, and contrast with respect to the brightness of the inner surface of said hemispherical shell.
Dependencies are inferred from the claim text.