Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Invertible or reversible multifocal type
Patent
1994-04-25
1996-03-12
Sikes, William L.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Invertible or reversible multifocal type
351 41, 351 55, G02C 706
Patent
active
054990637
ABSTRACT:
A multifocal trial frame system includes a trial frame shaped to engage the head of a wearer and which includes an adjustable nose bridge and a pair of downwardly-depending studs which are laterally adjustable relative to the nose bridge, a pair of lens brackets adjustably attachable to the studs, each including first and second lens rims; a pair of distance prescription lenses shaped to be retained by the first pair of rims; and a pair of multifocal lenses shaped to be received by the second pair of rims. The multifocal lenses each include a neutral portion and an insert portion having a close-viewing prescription. The insert portion is incorporated into the neutral portion to form a continuous, unitary lens with the neutral portion, so that the distance and the multifocal lenses cooperate to simulate multifocal eyeglasses of a predetermined prescription and configuration. In a preferred embodiment, the trial frame system includes a plurality of pairs of distance prescription lenses, each of a different predetermined magnification, a plurality of multifocal lenses, each pair having an insert portion of a different, predetermined configuration and magnification. The trial frame system thus is able to simulate multifocal lenses of the executive, graduated, flat top, trifocal and above-and-below configurations, and for the first time, make it possible for a patient to make a subjective evaluation of the performance and merits of a multifocal lens design.
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patent: 2103340 (1937-12-01), Schneck
patent: 2835161 (1954-04-01), Williams
patent: 2842029 (1958-07-01), Roth
patent: 4289386 (1981-09-01), Brandstetter
patent: 4448501 (1984-05-01), Cogez
Butler E. Dean
Risk Craig H.
Dang Hung Xuan
Sikes William L.
Vision Express Group Limited
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