Inventors:
Henry M. Zalewski - Carteret NJ
International Classification:
A61B 310, A61B 304, A61B 300, G02C 1102
Abstract:
Measurement of interpupillary distance is facilitated by providing a spectacle frame or the like to be worn by the optometrist, bearing at least two and preferably three indicia on said frame, in positions respectively adjacent the temples of the frame, and one centrally located adjacent the bridge. In measuring the interpupillary distance a preferred method, using the frame apparatus, is to instruct the patient to fix on one of the temporal indicia, and position the index or zero point, of an interpupillary rule directly in line with the center of the pupil on the same side as the indicium on which the patient is fixed. Then, without moving the rule, the optometrist instructs the patient to fix on the other temporal indicium, and reads from the rule the point opposite the pupil on that side. The interpupillary distance so measured corresponds substantially to the interpupillary distance at infinity -- i. e. in the absence of convergence.