Measurement of interpupillary distance

Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding

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Details

351 19, 351 39, 351 51, A61B 310, A61B 304, A61B 300, G02C 1102

Patent

active

041313380

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. For near-vision interpupillary distance, the patient is instructed to fix on the central indicium, while the optometrist positions his face at a position removed from the patient's face by substantially the patient's comfortable reading distance, and measures the center-to-center interpupillary distance.

REFERENCES:
patent: 1505447 (1924-08-01), Uhlemann
patent: 1555388 (1925-09-01), Schumacher
patent: 2884702 (1959-05-01), Engelmann

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