Method of establishing a unique machine independent reference fr

Details Method of establishing a unique machine independent reference fr Method of establishing a unique machine independent reference fr

1993-07-14

1995-12-12

Pellegrino, Stephen C.

Surgery

Instruments

Light application

606 10, 351237, 351246, 128745, A61B 302

Patent

active

054745489

ABSTRACT:
The invention relates to a method and apparatus for uniquely and unambiguously aligning a patient's visual line of sight (LOS) to the optical axis of an ophthalmic instrument such as may be used for laser surgery or diagnostics. By the method of the invention, two alignment targets are imaged at different distances along the optical axis of the ophthalmic instrument. Viewing along the optical axis, a patient moves his or her eye until the two imaged targets are in alignment. When the two imaged targets are viewed in alignment by the patient, the patient's LOS is precisely aligned with the optical axis of the apparatus. By relying on the patient's ability to self-align, this technique ensures that measurements are taken within a reproducible reference frame that is unique to each patient but independent of the type of machine used. The invention is applicable to many instruments and procedures which require precise tracking and positioning of the eye, especially ocular laser surgery devices and various diagnostic instruments employed in tissue imaging or surface topography measurements.

REFERENCES:
patent: 3861790 (1975-01-01), Tamura
patent: 3883234 (1975-05-01), Lynn et al.
patent: 4059348 (1977-11-01), Jernigan
patent: 4274715 (1981-06-01), Reiner
patent: 4848340 (1989-07-01), Bille et al.

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