Ophthalmic contact lens with internal fixation light for examination of the optic nerve
First Claim
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1. An instrument for examining the optic nerve in a patient'"'"'s eye, comprising:
- a contact lens for placement on the cornea of said patient'"'"'s eye;
a source of light for providing a fixation target in said contact lens for said patient'"'"'s eye;
a means for collimating and directing a narrow diameter beam of light from said source of light to a point in said patient'"'"'s eye a fixed distance away from the optic nerve head of said patient'"'"'s eye; and
a means for observing the optic nerve of said patient'"'"'s eye.
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Abstract
An instrument and method for examining the optic nerve head (34) of a patient'"'"'s eye (14) is disclosed. The instrument is comprised of a gonioscopic lens (10) a lens system (26) where the lens system (26) directs a collimated beam of light towards a point (32) away from the center line (28) through the gonioscopic lens (10) and eye (14). When the patient fixates on the beam of light (32), the ophthalmologist can examine the optic nerve head (34) through the gonioscopic lens (10).
29 Citations
8 Claims
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1. An instrument for examining the optic nerve in a patient'"'"'s eye, comprising:
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a contact lens for placement on the cornea of said patient'"'"'s eye; a source of light for providing a fixation target in said contact lens for said patient'"'"'s eye; a means for collimating and directing a narrow diameter beam of light from said source of light to a point in said patient'"'"'s eye a fixed distance away from the optic nerve head of said patient'"'"'s eye; and a means for observing the optic nerve of said patient'"'"'s eye. - View Dependent Claims (2, 3, 4, 5)
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6. An instrument for examining the optic nerve in a patient'"'"'s eye, comprising:
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a contact lens for placement on the cornea of said patient'"'"'s eye; a graded index lens mounted on said contact lens at a position offset from a center line through said contact lens; a source of light connected to said graded index lens by an optical fiber, said graded index lens directing a narrow diameter beam of light to a point in said patient'"'"'s eye a fixed distance away from the optic nerve head of said patient'"'"'s eye.
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7. An instrument for examining the optic nerve of a patient'"'"'s eye, comprising:
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a contact lens for placement on the cornea of said patient'"'"'s eye; a light source embedded in said contact lens at a position offset from a center line through said contact lens; a means for collimating and directing a narrow diameter beam of light from said light source to a point in said patient'"'"'s eye a fixed distance away from the optic nerve head of said patient'"'"'s eye; and a means for observing the optic nerve of said patient'"'"'s eye.
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8. A method for examining the optic nerve in a patient'"'"'s eye, comprising the step of:
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placing a contact lens on the cornea of said patient'"'"'s eye; directing a narrow diameter, a collimated beam of light through said contact lens to a point in said patient'"'"'s eye a fixed distance away from the optic nerve head of said patient'"'"'s eye; and observing the optic nerve through said contact lens while said patient'"'"'s eye is fixated on said narrow diameter, collimated beam of light.
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Specification