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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
First Claim
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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.

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