Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type
Patent
1981-07-22
1985-02-19
Corbin, John K.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Subjective type
351229, A61B 302
Patent
active
045001804
ABSTRACT:
An improved refractor for use in the subjective examination of human eyes. Each half of the refractor includes a plurality of lens supporting disks, a hub assembly for rotatably supporting the disks, and a comb assembly to space the disks along the optical axis. One of the disks supports at least one set of 4 cross cylinder lenses. Each disk is coupled to a stepping motor for selective rotation. Each motor is, in turn, supported by a bracket which permits rotation equivalent to a partial motor step to insure alignment of the optical elements supported on the disks with the optical axis. The cylinder lenses supported on the disks are also rotated by a stepping motor. The Risley prisms of each half of the refractor are always positioned on the optical axis and rotated by stepping motors. Finally, the refractor includes electronics, including a microprocessor, to control the rotation of the motors as required to move the various optical components as necessary to emulate the ophthalmic prescription of the person whose eyes are being examined.
REFERENCES:
patent: 3791719 (1974-02-01), Kratzer et al.
patent: 3860330 (1975-01-01), Persson
patent: 3969020 (1976-07-01), Lynn et al.
patent: 4185896 (1980-01-01), Buhler
Guyton, Automated Clinical Refraction, Clinical Ophthamology, vol. 1, chapt. 67, pp. 1-29.
Marg et al., Computer Assisted Eye Examination, American Journal of Optometry and Physiological Optics, vol. 54, No. 1, Jan. 1977 pp. 2-18.
Marg, Computer Assisted Eye Examination, American Journal of Optometry, vol. 50, No. 8, Aug. 1973, pp. 601-615.
Bausch & Lomb Incorporated
Bogdon Bernard D.
Corbin John K.
Dzierzynski Paul M.
Morgan DeWitt M.
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