Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1995-12-22
1998-07-21
Dang, Hung X.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, A61B 300
Patent
active
057841470
ABSTRACT:
The invention is directed to an ophthalmoscopic or gonioscopic lens system as well as an adapter lens systems for use with such an associated lens apparatus. The indirect ophthalmoscopy lens of the invention for use in examination or laser treatment of a patient's eye comprises a hand-held, pre-set or fixed system having at least two lens elements, each having first and second surfaces. At least one of the lens elements includes an aspheric surface of revolution. The at least two lens elements are positioned adjacent one another in a housing, such that the refractive properties of each are combined to converge light from an illumination light source to the entrance pupil of the patient's eye to illuminate the fundus thereof and form a fundus image to be viewed. The adapter lens systems of this invention are designed for use with an associated ophthalmoscopic lens, enabling selective modification of the optical characteristics of the ophthalmoscopic lens system in a predetermined manner. Within the scope of this invention, a plurality of attachments make possible change in the net power, optical imaging characteristics, magnification, laser transmission properties or other characteristics of a particular ophthalmoscopic lens.
REFERENCES:
patent: 4307944 (1981-12-01), Schirmer
patent: 4469413 (1984-09-01), Shirayanagi
patent: 4627694 (1986-12-01), Volk
patent: 4682866 (1987-07-01), Volk
patent: 4721378 (1988-01-01), Volk
patent: 4728183 (1988-03-01), Heacock
patent: 4738521 (1988-04-01), Volk
patent: 5007729 (1991-04-01), Erickson et al.
patent: 5046836 (1991-09-01), Volk
patent: 5309187 (1994-05-01), Crossman et al.
patent: 5479222 (1995-12-01), Volk
"Conoid Lenses for Indirect Ophthalmoscopy" by David Volk, MD, International Ophthalmology Clinics, Refraction--Aspheric Opthalmic Lenses, Jun., 1965, vol. 5, No. 2.
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