A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
88/121.5
A61B 3/00 (2006.01) A61B 3/02 (2006.01)
Patent
CA 1167301
ABSTRACT OF THE DISCLOSURE An improved refractor for use in the subjective examination of human eyes. Each half of the refractor in- cludes 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 align- ment 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. -1-
388901
Stevens Donn E.
Bausch & Lomb Incorporated
Gowling Lafleur Henderson Llp
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