Process and arrangement for examining a section of the eye

Details Process and arrangement for examining a section of the eye Process and arrangement for examining a section of the eye

1999-03-08

2000-08-01

Manuel, George

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351216, A61B 310

Patent

active

060956488

ABSTRACT:
Systems, methods, and apparatus are provided for deriving the relative position of an eye by tracking a boundary of the eye such as the limbus (i.e., the interface between the white sclera and the colored iris). A technique for tracking the position of the eye of patient comprises directing light to an annular region of the eye between the sclera and the iris and receiving reflected light from that region. The intensity of the reflected light is then measured to determine a relative position of the eye. In some embodiments, the measured region is scanned around the boundary. In other embodiments, a light spot is scanned around a substantially annular trajectory radially outward from the pupil. The signals corresponding to the intensity of the reflected light are then processed and measured to determine the eye's position. A flap of tissue covering the boundary may be automatically detected so as to selectively measure the boundary away from the flap. The invention also provides for integrating the eye tracker into a laser eye surgery system.

REFERENCES:
patent: 5071421 (1991-12-01), Stahl
patent: 5320113 (1994-06-01), Tan
patent: 5321501 (1994-06-01), Swanson et al.
patent: 5374272 (1994-12-01), Arpa et al.
patent: 5493109 (1996-02-01), Wei et al.
patent: 5506634 (1996-04-01), Wei et al.
patent: 5537162 (1996-07-01), Hellmuth et al.
patent: 5706073 (1998-01-01), Volk

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