Manual ophthalmoscope

• US 4,538,889 A
• Filed: 11/29/1982
• Issued: 09/03/1985
• Est. Priority Date: 12/01/1981
• Status: Expired due to Term

• Current Assignee: Propper Manufacturing Co. Inc.
• Original Assignee: Heine USA Limited (Heine), Propper Manufacturing Co. Inc.
• Inventors: Schmidt, Otto H., Heine, Helmut A., Rosenbusch, Helmut W.
• Primary Examiner(s): Bovernick, Rodney B.
• Assistant Examiner(s): Dzierzynski, Paul M.
• Application Number:
  US06/445,150
• Time in Patent Office: 1,009 Days
• Field of Search: 351/205, 351/206, 351/210, 351/211, 351/212, 351/213, 351/214, 351/233, 351/234, 351/235, 356/128, 356/131
• US Class Current: 351/205
• CPC Class Codes: A61B 3/1208 Multiple lens hand-held instruments

Abstract

The inventive manual ophthalmoscope is provided with a housing 1 which is closed on all sides and in which the optical components 7, 8, 9, 13, 14 are housed in an entirely dustproof manner. The necessary switching operations for interposing correction lenses 15, 16, lighting field masks, color filters etc. into the illumination and/or observation light path 2, 3 are effected by electomagnetic drives 17, 18, 19, 20 which are adapted to be operated by means of operating elements 21, 22, 23 provided on the outside of housing 1 in optimum positions from an ergonomic point of view. The display of refraction values of correction lenses 15, 16 interposed into the observation light path as well as information deducible therefrom is effected in an optoelectronic manner.

Claims

1. An ophthalmoscope for examining a patient'"'"'s eyes comprising a housing, an illumination system for directing light on the eye under examination, said illumination system located within said housing and including an illumination light path, an optical imaging system rotatable about an axis, said optical imaging system formed of a plurality of parts including at least one of apertures and measuring marks, a first motor for rotating said optical imaging system about said axis to interpose any one of said parts into said illumination light path so as to produce an image of said aperture or measuring mark on the fundus of the eye under examination, an observation system for viewing the eye under examination, said observation system located within said housing and including an observation light path, a gross adjustment lens carrier rotatable about an axis, a plurality of lenses located on said gross adjustment lens carrier, a second motor for rotating said gross adjustment lens carrier about said axis to interpose any one of said lenses into said observation light path, a fine adjustment lens carrier rotatable about an axis, a plurality of lenses located on said fine adjustment lens carrier, a third motor for rotating said fine adjustment lens carrier about said axis to interpose anyone of said lenses into said observation light path, said gross adjustment lens carrier and said fine adjustment lens carrier adapted to cooperate to provide a wide range of refraction values, position detection means located within said housing for generatng position signals corresponding to the position of said optical imaging system, said gross adjustment lens carrier and said fine adjustment lens carrier, display means visible from outside said housing and responsive to said position signals for providing a visual indication of the position of said optical imaging system, said gross adjustment lens carrier and said fine adjustment lens carrier, a plurality of operating elements accessible from outside of said housing and adapted to be operated to drive said second and third motors to respectively rotate said said gross adjustment lens carrier and said fine adjustment lens carrier, computer means located within said housing, said computer means adapted to receive the position signals corresponding to the position of said gross adjustment lens carrier and said fine adjustment lens carrier and provide an output indicative of the refraction of the eye under examination, said display means adapted to receive said output and provide a visual indication of said refraction and said computer means being in communication with and adapted to drive said first motor to achieve movement of said optical imaging system in response to said output so as to provide a constant clear image of said aperture or measuring mark of said optical imaging system on the fundus of the eye under examination notwithstanding the positions of said gross adjustment lens carrier and said fine adjustment lens carrier.

2. Apparatus as in claim 1 which further comprises an aperture carrier rotatable about an axis, a plurality of apertures located on said aperture carrier, a fourth motor for rotating said aperture carrier about said axis to interpose any one of said apertures into said ilumination light path, a filter carrier rotatable about an axis, a plurality of filters located on said filter carrier, a fifth motor for rotating said filter carrier about said axis to interpose anyone of said filters in said illumination light path, said position detection means adapted to generate position signals corresponding to the position of said aperture carrier and said filter carrier and said display means adapted to provide a visual indication of the position of said aperture carrier and said filter carrier.

3. An ophthalmoscope for examining a patient'"'"'s eyes comprising a housing, an illumination system for directing light on the eye under examination, said illumination system located within said housing and including an illumination light path, an optical imaging system disposed within said illumination light path, an aperture carrier rotatable about an axis, a plurality of apertures located on said aperture carrier, a first motor for rotating said aperture carrier about said axis to interpose any one of said apertures into said ilumination light path, a filter carrier rotatable about an axis, a plurality of filters located on said filter carrier, a second motor for rotating said filter carrier about said axis to interpose anyone of said filters in said illumination light path, an observation system for viewing the eye under examination, said observation system located within said housing and including an observation light path, a gross adjustment lens carrier rotatable about an axis, a plurality of lenses located on said gross adjustment lens carrier, a third motor for rotating said gross adjustment lens carrier about said axis to interpose any one of said lenses into said observation light path, a fine adjustment lens carrier rotatable about an axis, a plurality of lenses located on said fine adjustment lens carrier, a fourth motor for rotating said fine adjustment lens carrier about said axis to interpose anyone of said lenses into said observation light path, said gross adjustment lens carrier and said fine adjustment lens carrier adapted to cooperate to provide a wide range of refraction values, position detection means located within said housing for generating position signals corresponding to the position of said optical imaging system, said aperture carrier, said filter carrier, said gross adjustment lens carrier and said fine adjustment lens carrier, display means visible from outside said housing and responsive to said position signals for providing a visual indication of the position of said aperture carrier, said filter carrier, said gross adjustment lens carrier and said fine adjustment lens carrier, a plurality of operating elements accessible from outside of said housing and adapted to be operated to drive said first, second, third and fourth motors to respectively rotate said aperture carrier, said filter carrier, said gross adjustment lens carrier and said fine adjustment lens carrier, each of said aperture carrier, filter carrier, gross adjustment lens carrier and fine adjustment lens carrier having a neutral position which position is desirable at the beginning of an examination, said plurality of operating elements further including a neutral position element adapted to be operated to drive said first, second, third and fourth motors to rotate said aperture carrier, filter carrier, gross adjustment lens carrier and fine adjustment lens carrier to their respective neutral positions.