A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
A61B 3/02 (2006.01) G02C 13/00 (2006.01)
Patent
CA 2073857
An apparatus and method for subjectively determining the proper position- ing of progressive power or other corrective lenses are disclosed. The apparatus in- cludes a target (30) such as a small fiber optic (66) or other light source and one or more marking rods (34) which may be activated by the patient. While wearing pre-fitted frames (26) and fixating on a remote target (RT), the patient places the light source (30) against or immediately adjacent the exterior surface (18) of the simulat- ed or other lens (22) within either of the frames and positions the light so that it is centered in his or her line of sight (94). Once the light is centered the patient acti- vates the marking rod which contacts, and marks, the exterior surface of the lens. Because the light source and marking rod or rods are designed to obstruct verylittle of the patient's vision, his or her peripheral vision remains intact during the process, thereby allowing binicular fusion to occur and avoiding introduction of phoria errors into the positioning process.
Bereskin & Parr
Marshall Forrest A.
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