Ophthalmic refractor having retrofittable readout illumination

Details Ophthalmic refractor having retrofittable readout illumination Ophthalmic refractor having retrofittable readout illumination

A - Human Necessities

61

B

A61B 3/028 (2006.01)

Patent

CA 2406474

A subjective ophthalmic refractor is improved for operator visibility in a darkened examination room by forming a cylinder axis scale of the refractor as a light- transmitting component having opaque scale gradations and installing a polar array of illumination sources to project light through the cylinder axis scale, which preferably includes a translucent material for diffuse illumination. In an alternative embodiment, the cylinder axis scale includes a photoluminescent material to which the scale gradations are applied. The refractor is further improved by installing respective illumination sources near a cylinder power readout and a sphere power readout of the refractor. The disclosure additionally relates to a method for retrofitting an ophthalmic refractor to illuminate the cylinder axis scale, cylinder power readout, and sphere power readout.

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