Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1994-01-14
1995-12-12
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, 351214, 351221, A61B 312, A61B 313, A61B 315
Patent
active
054754518
ABSTRACT:
An ophthalmologic apparatus for repeated optical or photometric examination of the fundus or another portion of a patient's eye has an illuminating unit with a light source for a microscope. The optical axis of the microscope can be repeatedly moved to one and the same position relative to a beam of radiation issuing from the center of curvature of the external surface of the cornea in a patient's eye with assistance from a positive field lens which is adjustable with the microscope and acts not unlike an ophthalmoscopic lens for indirect ophthalmoscopy. The lens projects for the microscope a real intermediate image of the selected portion of a patient's eye in an intermediate plane adjacent that focal point of the lens which is remote from the patient's eye. An illuminated or radiation emitting marker is provided at that side of the intermediate plane which faces away from the lens and close to the optical axis of the microscope. The aforementioned components of the apparatus are jointly adjustable by the person in charge along one, two or all three axes which intersect and are inclined relative to each other. Such adjustment is carried out until the intermediate plane receives a sharp image of the selected portion of a patient's eye. A selected portion of the intermediate plane (namely a portion which is observable through the microscope) provides for the microscope a sharp image of the illuminated marker with assistance from a patient's eye in that the external surface of the cornea performs the function of a spherical mirror.
REFERENCES:
patent: 4439024 (1984-03-01), Ito
patent: 4452517 (1984-06-01), Kohayakawa
patent: 4572627 (1986-02-01), Madate et al.
patent: 4662731 (1987-05-01), Robert et al.
Hendrickson Phillip
Papritz Franz
Robert Yves
Farber Martin A.
Parsons David R.
Robert Yves
Sikes William L.
LandOfFree
Ophthalmologic apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ophthalmologic apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ophthalmologic apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1363560