Patent ID: 6692128
Filing Date: 2004-02-17
Classification: A61B

Abstract:
An ophthalmic refractor comprising:a viewing path; a housing having a display window; a lens carrier holding a plurality of lenses, said lens carrier being rotatably mounted in said housing to permit a chosen one of said plurality of lenses to be positioned in said viewing path; a rotatable adjustment knob; first and second gears fixed to said adjustment knob for rotation therewith; a ring-shaped scale including an internal gear meshing with said first gear, said scale having angularly spaced markings viewable through said display window; a third gear meshing with said second gear; a driver plate coaxial with said third gear and operatively connected to said lens carrier for rotating said lens carrier; and means for selectively securing said driver plate to said third gear at any chosen angular orientation relative to said third gear.