Inventors:
David Biggins - Williamsville NY
Douglas H. Hoover - Corfu NY
Carl E. Hynes - Williamsville NY
Donald E. Miller - West Seneca NY
Assignee:
Reichert, Inc. - Depew NY
International Classification:
A61B 302
Abstract:
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.