Ophthalmoscope with linear polarizer
First Claim
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1. In an ophthalmoscope having a housing, a viewing passage therethrough, and an illumination source positioned to project a beam of light through said viewing passage;
- means for selectively modifying the light projected through said passage and the light observed through said passage comprising;
a frame member mounted in said housing adjacent the viewing passage and the illumination source beam of light;
a plurality of light filtering members disposed in said frame member; and
single actuating means for selectively positioning said frame member to align one light filtering member in the illumination source beam of light and another light filtering member in said viewing passage.
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Abstract
An ophthalmoscope is provided with a slidably mounted rack which carries two polarizing filters mounted at right angles to each other so as to simultaneously position one filter in the light path and the other in the viewing path. The rack also carries a clear lens and a red-free filter for optional positioning in the light path.
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Citations
15 Claims
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1. In an ophthalmoscope having a housing, a viewing passage therethrough, and an illumination source positioned to project a beam of light through said viewing passage;
- means for selectively modifying the light projected through said passage and the light observed through said passage comprising;
a frame member mounted in said housing adjacent the viewing passage and the illumination source beam of light; a plurality of light filtering members disposed in said frame member; and single actuating means for selectively positioning said frame member to align one light filtering member in the illumination source beam of light and another light filtering member in said viewing passage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- means for selectively modifying the light projected through said passage and the light observed through said passage comprising;
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8. In an ophthalmoscope having a housing, a viewing passage therethrough, a light source, lens and mirror light transmission means disposed to transmit a beam of light from said source through said viewing passage to the patient'"'"'s eye, and light filtering means comprising:
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an aperture rack member movably mounted in said housing; a plurality of light filter members disposed in said rack member characterized by first and second light filter members disposed adjacent to each other, in one portion of said rack member with said second light filter member being disposed in a plane at right angles to the plane of said first filter member, an actuating member slidably mounted in said housing having a finger actuator portion extending through said housing; said actuating member being operatively connected to said aperture rack so that a physician may selectively position at least one of said light filter members in the beam of light transmitted to the patient'"'"'s eye; said actuating member being operatively connected to said aperture rack so that when one of said first and second filter members is positioned in the light transmitted to the patient'"'"'s eye, the second filter is positioned in the viewing passage to the physician'"'"'s eye to filter light reflected from the patient'"'"'s eye. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. In an ophthalmoscope having a housing, a viewing passage therethrough, light source, lens and mirror light transmitting means disposed to transmit a beam of light from said source through said viewing passage to the patient'"'"'s eye in virtual co-axial relationship with said viewing passage;
- means for selectively reducing glare in the light reflected from the patient'"'"'s eye comprising;
an aperture rack slidably mounted in said housing; a pair of polarizing light filtering members mounted in said aperture rack; single actuating means operatively connected to said polarizing light filtering members for selectively positioning said filtering elements into and out of the light and viewing paths; so that when positioned in said paths, one of said polarizing light filter elements is disposed in the beam of light to illuminate the patient'"'"'s eye and the other of said polarizing light filter elements is disposed in the viewing passage to filter the light reflected from the patient'"'"'s eye so that reflected glare from the cornea of the eye is reduced to permit a more effective examination of the retina of the eye.
- means for selectively reducing glare in the light reflected from the patient'"'"'s eye comprising;
Specification