# US 7,744,219 B2 · Binocular indirect ophthalmoscope fixation light > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,744,219 B2 - Document ID: US7744219B2 - Status: Granted - Kind: B2 - Application number: 12/125,823 - Filed: 2008-05-22 - Published: 2008-11-27 - Granted: 2010-06-29 - Earliest claimed: 2007-05-26 - Inventors: Andrew Peter Davis - Web page: https://patentgrep.com/patent/US7744219B2 ## CPC - A61B 3/125: with contact lenses - A61B 3/0091: {Fixation targets for viewing direction} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract A binocular indirect opthalmoscope assembly and fixation light system is disclosed for easily directing the patient's line of sight in a direction that places the optic nerve and surrounding vessels in the center of the examiner's view. The fixation system includes two fixation light assemblies that may be mounted onto the binocular indirect opthalmoscope assembly and activated by a motion sensor. ## Claims ### Claim 1 A binocular indirect ophthalmoscope assembly comprising: an ophthalmoscope housing having a right and a left eyepiece for use by an examiner; an optical system contained in the ophthalmoscope housing for reflecting light along a optical viewing axis to each of the eyepieces; a binocular indirect fixation system, comprising; a first fixation light source configured to direct a beam of light to towards a patient, thereby causing the patient to gaze so as to place the optic nerve and surrounding retinal vessels of the eye under examination in the center of the examiner's view; and a second fixation light source configured to generate a beam of light that is hidden from view by the patient by at least one of the ophthalmoscope housing or a fixation light source housing when the patient is gazing at the first fixation light. ### Claim 2 (depends on 1) The binocular indirect ophthalmoscope assembly of claim 1, wherein the binocular indirect fixation system is removably mounted to the ophthalmoscope housing. ### Claim 3 (depends on 1) The binocular indirect ophthalmoscope assembly of claim 1, wherein the fixation light assemblies of the binocular indirect fixation system are mounted on either side of the ophthalmoscope housing. ### Claim 4 (depends on 1) The binocular indirect ophthalmoscope assembly of claim 1, wherein the fixation light housing has two sides, a first mounting side and a second fixation light source side. ### Claim 5 (depends on 4) The binocular indirect ophthalmoscope assembly of claim 4, wherein the first mounting side of the fixation light housing is mounted to the ophthalmoscope housing. ### Claim 6 (depends on 1) The binocular indirect ophthalmoscope assembly of claim 1, wherein the binocular indirect fixation system is activated by movement of the ophthalmoscope housing. ### Claim 7 (depends on 6) The binocular indirect ophthalmoscope assembly of claim 6, wherein the binocular indirect fixation system comprises a microprocessor in communication with a motion sensing device to turn on at least one fixation light source in response to motion detected by the motion sensing device. ### Claim 8 (depends on 1) The binocular indirect ophthalmoscope assembly of claim 1, wherein at least one of the fixation light sources is an LED. ### Claim 9 (depends on 1) The binocular indirect ophthalmoscope assembly of claim 1, wherein the binocular indirect fixation system is connected by direct wiring to a power source. ### Claim 10 (depends on 1) The binocular indirect ophthalmoscope assembly of claim 1, wherein the first and second fixation light sources are positioned adjacent to the right and left eyepieces, respectively, of the ophthalmoscope housing. ### Claim 11 A binocular indirect fixation system for use in association with an indirect ophthalmoscope assembly to enable an examiner to examine a patient's retina, comprising: a first fixation light configured to direct a beam of light to towards a patient, thereby causing the patient to gaze so as to place the optic nerve and surrounding retinal vessels of the eye under examination in the center of the examiner's view; and a second fixation light configured to generate a beam of light that is hidden from view by the patient by at least one of an ophthalmoscope assembly housing or a fixation light source housing when the patient is gazing at the first fixation light. ### Claim 12 (depends on 11) The binocular indirect fixation system of claim 11, wherein the first and second fixation light sources are removably mounted to the indirect ophthalmoscope. ### Claim 13 (depends on 11) The binocular indirect fixation system of claim 11, wherein the fixation light housing has two sides, a first mounting side and a second fixation light source side. ### Claim 14 (depends on 13) The binocular indirect fixation system of claim 13, wherein the first mounting side of the fixation light housing is mounted to the indirect ophthalmoscope. ### Claim 15 (depends on 11) The binocular indirect fixation system of claim 11, wherein the binocular indirect fixation system is activated by movement. ### Claim 16 (depends on 15) The binocular indirect fixation system of claim 15, wherein the binocular indirect fixation system comprises a microprocessor in communication with a motion sensing device to turn on at least one fixation light source in response to motion detected by the motion sensing device. ### Claim 17 (depends on 11) The binocular indirect fixation system of claim 11, wherein at least one of the fixation light sources is an LED. ### Claim 18 (depends on 11) The binocular indirect fixation system of claim 11, wherein the binocular indirect fixation system is connected by direct wiring to a power source.