# US 5,349,398 A · Ophthalmometer system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,349,398 A - Document ID: US5349398A - Status: Granted - Kind: A - Application number: 07/915,912 - Filed: 1992-07-17 - Granted: 1994-09-20 - Earliest claimed: 1992-07-17 - Assignees: The Trustees of Columbia University in the City of New York - Inventors: Charles J. Koester - Web page: https://patentgrep.com/patent/US5349398A ## CPC - A61B 3/107: for determining the shape or measuring the curvature of the cornea - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract An ophthalmometer system is provided which includes a white light source for illuminating a cornea during surgery, along with an infrared light generator for imaging concentric rings onto the cornea and a detection system for receiving the reflected infrared rings and providing them to a display to enable the surgeon to see the corneal topology as indicated by the nonconcentricity or concentricity of the reflected rings. The surgeon can thus view the cornea topology concurrently with surgical operations on the eye. ## Claims ### Claim 1 An optical system for illuminating the cornea during surgery and for measuring corneal topography, comprising: first means for illuminating the cornea with first component light that is visible to a surgeon; second means for illuminating the cornea with second component light having at least one characteristic different from the first component light, wherein the second means for illuminating includes a reticle means for generating a ringed pattern to illuminate the cornea; and third means for directing the second component light to a corneal topography measuring apparatus while excluding said first component light. ### Claim 2 (depends on 1) The optical system according to claim 1, wherein the first means for illuminating comprises a white light source. ### Claim 3 (depends on 1) The optical system according to claim 1, wherein the second means for illuminating comprises an infrared light source. ### Claim 4 (depends on 1) The optical system according to claim 1, wherein the third means comprises a cold mirror. ### Claim 5 (depends on 1) The optical system according to claim 1, wherein the third means comprises an infrared transmitting filter. ### Claim 6 An optical system for illuminating the cornea during surgery and for measuring corneal topography, comprising: first means for illuminating the cornea with first component light that is visible to a surgeon; second means for illuminating the cornea with second component light having at least one characteristic different from the first component light; and third means for directing the second component light to a corneal topography measuring apparatus while excluding said first component light; wherein the first means for illuminating comprises a source of white light having a band of wavelengths missing. ### Claim 7 (depends on 6) The optical system according to claim 6, wherein the second means for illuminating comprises a source having said band of wavelengths. ### Claim 8 (depends on 7) The optical system according to claim 7, wherein said second means for illuminating comprises a laser. ### Claim 9 (depends on 7) The optical system according to claim 7, wherein the second means for illuminating comprises a light emitting diode. ### Claim 10 (depends on 7) The optical system according to claim 7, wherein the third means comprises filter/mirror means passing only the band of wavelengths. ### Claim 11 An optical system for illuminating the cornea during surgery and for measuring corneal topography, comprising: first means for illuminating the cornea with first component light that is visible to a surgeon; second means for illuminating the cornea with second component light having at least one characteristic different from the first component light; and third means for directing the second component light to a corneal topography measuring apparatus while excluding said first component light; wherein the first means for illuminating comprises a white light source and wherein the second component light is chopped. ### Claim 12 (depends on 11) The optical system according to claim 11, wherein the second component light is chopped at a frequency greater than about 60 Hz. ### Claim 13 (depends on 11) The optical system according to claim 11, wherein said second means for illuminating comprises a light source chopped out of phase with said white light source. ### Claim 14 (depends on 13) The optical system according to claim 13, wherein the third means comprises a chopper which passes only light from said second means. ### Claim 15 (depends on 11) The optical system according to claim 11, wherein said second means for illuminating comprises a light source chopped at a different frequency than said white light source. ### Claim 16 An optical system for illuminating the cornea during surgery and for measuring corneal topography, comprising: first means for illuminating the cornea with first component light that is visible to a surgeon; second means for illuminating the cornea with second component light having at least one characteristic different from the first component light; and third means for directing the second component light to a corneal topography measuring apparatus while excluding said first component light; wherein the first means for illuminating comprises a white light source and wherein the white light source is substantially continuous. ### Claim 17 (depends on 16) The optical system according to claim 16, wherein said second means for illuminating comprises a light source having an output which varies over time. ### Claim 18 (depends on 17) The optical system according to claim 17, wherein said second means for illuminating comprises a light source which is chopped. ### Claim 19 (depends on 17) The optical system according to claim 17, wherein said second means for illuminating comprises a modulated light source. ### Claim 20 (depends on 17) The optical system according to claim 17, wherein the third means comprises a detector responding only to the second means. ### Claim 21 An optical system for illuminating the cornea during surgery and for measuring corneal topography, comprising: first means for illuminating the cornea with first component light that is visible to a surgeon; second means for illuminating the cornea with second component light having at least one characteristic different from the first component light and including infrared light; and third means for directing the second component light to a corneal topography measuring apparatus while excluding said first component light; wherein the third means comprises a camera sensitive only to infrared light. ### Claim 22 An optical system for illuminating the cornea during surgery and for measuring corneal topography, comprising: first means for illuminating the cornea with light having at least a first wavelength component in the visible spectrum; second means for illuminating the cornea with light having a second wavelength different from the first wavelength component; third means for providing first wavelength component light reflected for viewing the cornea during a surgical operation; and fourth means for directing second component wavelength light reflected off the cornea to a corneal topography imaging apparatus while excluding said first component wavelength light, said apparatus having means for displaying corneal topography information in response to the second component wavelength light, to thereby provide sufficient light to illuminate the cornea for and during surgical operations, while enabling corneal topography and curvature information to be displayed concurrently with corneal illumination; wherein the second means for illuminating includes a reticle means for generating a ringed pattern to illuminate the cornea. ### Claim 23 (depends on 22) The optical system according to claim 22, wherein the first means for illuminating comprises a white light source. ### Claim 24 (depends on 22) The optical system according to claim 22, wherein the first means for illuminating further includes a lens system for magnifying the cornea. ### Claim 25 (depends on 22) The optical system according to claim 22, wherein the second means for illuminating comprises an infrared light source. ### Claim 26 (depends on 22) The optical system according to claim 22, wherein the first means for illuminating and the second means for illuminating generate light which is incident the cornea generally along coincident paths substantially along the central axis of the cornea. ### Claim 27 (depends on 22) The optical system according to claim 22, further including a corneal topography imaging apparatus comprises a video camera having a second filtering means for transmitting second wavelength component light while excluding first component wavelength component light and a video monitor connected to the camera for generating a display. ### Claim 28 An optical system for illuminating the cornea during surgery and for measuring corneal topography, comprising: first means for illuminating the cornea with light having at least a first wavelength component in the visible spectrum; second means for illuminating the cornea with light having a second wavelength different from the first wavelength component; third means for providing first wavelength component light reflected for viewing the cornea during a surgical operation; and fourth means for directing second component wavelength light reflected off the cornea to a corneal topography imaging apparatus while excluding said first component wavelength light, said apparatus having means for displaying corneal topography information in response to the second component wavelength light, to thereby provide sufficient light to illuminate the cornea for and during surgical operations, while enabling corneal topography and curvature information to be displayed concurrently with corneal illumination; wherein the third means comprises filtering means for transmitting first wavelength component light reflected off the cornea while reflecting second wavelength component light. ### Claim 29 (depends on 28) The optical system according to claim 28, wherein the filtering means comprises a mirror means for transmitting first wavelength component light and for reflecting second wavelength component light. ### Claim 30 An optical system for illuminating the cornea during surgery and for measuring corneal topography, comprising: first means for illuminating the cornea with light having at least a first wavelength component in the visible spectrum; second means for illuminating the cornea with light having a second wavelength component different from the first wavelength component; third means for providing first wavelength component light reflected for viewing the cornea during a surgical operation; fourth means for directing second component wavelength light reflected off the cornea to a corneal topography imaging apparatus while excluding said first component wavelength light, said apparatus having means for displaying corneal topography information in response to the second component wavelength light, to thereby provide sufficient light to illuminate the cornea for and during surgical operations, while enabling corneal topography and curvature information to be displayed concurrently with corneal illumination; and a hot mirror for combining the first and second wavelength component light, wherein the first wavelength component light is white light and the second wavelength light is infrared light; and wherein the first means for illuminating and the second means for illuminating generate light which is incident on the cornea generally along coincident paths substantially along the central axis of the cornea. ### Claim 31 An optical system for illuminating the cornea during surgery and for measuring corneal topography, comprising: first means for illuminating the cornea with light having at least a first wavelength component in the visible spectrum; second means for illuminating the cornea with light having a second wavelength different from the first wavelength component; third means for providing first wavelength component light reflected for viewing the cornea during a surgical operation; and fourth means for directing second component wavelength light reflected off the cornea to a corneal topography imaging apparatus while excluding said first component wavelength light, said apparatus having means for displaying corneal topography information in response to the second component wavelength light, to thereby provide sufficient light to illuminate the cornea for and during surgical operations, while enabling corneal topography and curvature information to be displayed concurrently with corneal illumination, and wherein the corneal topography imaging apparatus displays information indicating the sphericity of the cornea.