Ophthalmic guide for multi-focal spectacles

Details Ophthalmic guide for multi-focal spectacles Ophthalmic guide for multi-focal spectacles

1984-08-17

1986-03-18

Haroian, Harry N.

Geometrical instruments

Gauge

Spectacle

A61B 310

Patent

active

045759464

ABSTRACT:
A measuring device for prescribing special multi-focal spectacles featuring transparent members which overlay ophthalmic lenses. Each member has at least one horizontal stripe which is optically distinct from the remainder of the member, such as by having different transmissivity to light or by having opaque edges. The stripe has a lengthwise dimension which spans a lens fitting into the frame of the user and a vertical width dimension corresponding to the apparent dimension of a video display terminal seen at a terminal viewing distance. The members may be moved up and down with respect to spectacles until the image of the terminal is blocked or otherwise marked by the stripe. An ophthalmic practitioner may then measure the location of a stripe edge relative to the top or bottom of a lens or spectacle socket, thereby locating a terminal viewing power zone.

REFERENCES:
patent: 1621352 (1927-03-01), Currier
patent: 1804749 (1931-05-01), Desmond
patent: 2884832 (1959-05-01), Engelmann
patent: 3987554 (1976-10-01), Pastore
patent: 4024831 (1977-05-01), Sperling

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