In situ astigmatism axis alignment

Details In situ astigmatism axis alignment In situ astigmatism axis alignment

1994-09-19

1996-08-27

Sykes, Angela D.

Surgery

Instruments

Light application

606 10, A61B 1736

Patent

active

055495974

ABSTRACT:
An alignment module for determining the astigmatic axis of a patient and for aligning the cylindrical axis of a laser ablation system for ophthalmological surgery. A rotatable image element, such as target, is illuminated through a diffuser plate and an image of the target is presented along an optical path comprising a fixed collimating lens, a plurality of turning mirrors and a slidably adjustable imaging lens. The light source, diffuser plate, lenses and mirrors are all mounted on a platform which is attachable to a camera port of a surgical microscope normally installed in the delivery system optics of the laser surgery system. The movable lens is adjusted to a position corresponding to the required sphere correction, and the target is rotated until the patient sees the clearest target image, signifying alignment of the target with the astigmatic axis of the patient's eye. The alignment angle information is used to align the cylinder axis of the laser surgery system to the proper angle.

REFERENCES:
patent: 3084694 (1963-04-01), Kavanagh et al.
patent: 4298253 (1981-11-01), Tagnon
patent: 4409979 (1983-10-01), Roussel et al.
patent: 4861154 (1989-04-01), Sherwin et al.

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