Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1998-07-18
1999-04-06
Manuel, George
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
A61B 310
Patent
active
058925694
ABSTRACT:
A combination of a confocal scanning laser ophthalmoscope and external laser sources is used for microphotocoagulation purposes. An opto-mechanical linkage device and beamsplitter is used to align the pivot point of the Maxwellian view of the scanning laser ophthalmoscope with the pivot point of non-scanning external laser beams. The same pivot point is necessary to minimize wavefront aberrations and to enable precise focussing of a therapeutic laser beam on the retina. The location of the external laser beam on the retina is determined with the help of two synchronized detectors and image processing. One detector is used to localize moving fiducial landmarks of the retina. A second detector is used to locate on the retina the external laser aiming beam. Two different confocal apertures are used. Polarizing the aiming beam is necessary to further reduce unwanted reflections from the anterior corneal surface.
REFERENCES:
patent: 5430509 (1995-07-01), Kobayashi
patent: 5543866 (1996-08-01), Van De Velde
patent: 5568208 (1996-10-01), Van De Velde
patent: 5633695 (1997-05-01), Feke et al.
Manuel George
Van de Velde Jozef F.
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