Apparatus and methods for marking the visual center of the corne

Details Apparatus and methods for marking the visual center of the corne Apparatus and methods for marking the visual center of the corne

1988-03-03

1989-10-24

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, 351214, 351223, A61B 310, A61B 302

Patent

active

048757675

ABSTRACT:
An apparatus for identifying and marking the visual center of the cornea of a human eye includes a cylindrical tube for placement over the cornea of a human eye. The tube is open at one end and includes, inside the tube, a disk-shaped member having a central pinhole-sized opening near the open end of the tube. Farther from the open end of the tube are one or more illuminated disks having central pinhole-sized opacities, one in the shape of a ring, another in the shape of a dot. While a viewer focuses through the pinhole on these opacities, a movable member mounted coaxially with the tube is moved to engage and mark the central visual axis of the cornea.

REFERENCES:
patent: 1510114 (1924-09-01), Thorner
patent: 3602580 (1971-08-01), Samuels
patent: 4165744 (1979-08-01), Cravy et al.
patent: 4357079 (1982-11-01), Karasawa
patent: 4417579 (1983-11-01), Soloviev et al.
patent: 4515157 (1985-05-01), Fedorov et al.
patent: 4648400 (1987-03-01), Schneider et al.
patent: 4678297 (1987-07-01), Ishikawa et al.

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