# US 11,896,307 B2 · Ophthalmologic apparatus and method of controlling same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,896,307 B2 - Document ID: US11896307B2 - Status: Granted - Kind: B2 - Application number: 16/937,607 - Filed: 2020-07-24 - Published: 2020-11-12 - Granted: 2024-02-13 - Earliest claimed: 2018-03-27 - Assignees: Topcon Corporation - Applicants: Topcon Corporation - Inventors: Yoko Tatara; Michiko Nakanishi; Shunichi Morishima - Web page: https://patentgrep.com/patent/US11896307B2 ## CPC - A61B 3/102: {for optical coherence tomography [OCT]} - A61B 3/103: for determining refraction, e.g. refractometers or skiascopes - A61B 3/107: for determining the shape or measuring the curvature of the cornea - A61B 3/12: for looking at the eye fundus, e.g. ophthalmoscopes (A61B3/13 takes precedence) - A61B 3/152: {for aligning} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract An ophthalmologic apparatus includes a refractive power measurement optical system, a fixation projection system, an inspection optical system, and a controller. The refractive power measurement optical system includes a first focusing element capable of changing a focal position, and is configured to project first light onto a subject's eye and to detect returning light of the first light from the subject's eye via the first focusing element. The fixation projection system is configured to project fixation light target onto the subject's eye. The inspection optical system includes a second focusing element capable of changing a focal position in conjunction with the first focusing element, and is used for a predetermined inspection in which second light is projected onto at least the subject's eye via the second focusing element. The controller is configured to control the first focusing element and the second focusing element based on a detection result of the returning light, and to perform refractive power measurement using the first light in a state of promoting a fogging of the subject's eye by controlling the fixation projection system after performing the predetermined inspection by inspection optical system. ## Claims ### Claim 1 An ophthalmologic apparatus, comprising: a refractive power measurement optical system including a first focusing element capable of changing a focal position, and configured to project first light onto a subject's eye and to detect returning light of the first light from the subject's eye via the first focusing element; a fixation projection system configured to project a fixation target onto the subject's eye; an inspection optical system including a second focusing element capable of changing a focal position in conjunction with the first focusing element, and configured to perform a predetermined inspection in which second light is projected onto at least the subject's eye via the second focusing element; and a controller configured to control the first focusing element and the second focusing element based on a detection result of the returning light of the first light. the returning light being obtained by performing provisional measurement using the refractive power measurement optical system in a state where the fixation target is projected onto the subject's eye, and to perform refractive power measurement using the first light in a state of promoting a fogging of the subject's eye by controlling the fixation projection system after performing the predetermined inspection using the inspection optical system. ### Claim 2 (depends on 1) The ophthalmologic apparatus of claim 1, further comprising a holding member configured to hold the first focusing element and the second focusing element; and a driver configured to driver the holding member, wherein the controller is configured to control the driver to move the first focusing element and the second focusing element. ### Claim 3 (depends on 1) The ophthalmologic apparatus of claim 1, wherein the controller is configured to promote the fogging of the subject's eye by moving a focal position of an image of the fixation target in an optical axis direction of the fixation projection system from a position specified based on the detection result of the returning light. ### Claim 4 (depends on 3) The ophthalmologic apparatus of claim 3, wherein the fixation projection system includes a display unit configured to display the fixation target, and the controller is configured to change the focal position of the image of the fixation target by moving the display unit in the optical axis direction of the fixation projection system. ### Claim 5 (depends on 1) The ophthalmologic apparatus of claim 1, wherein the inspection optical system includes an OCT optical system configured to project measurement light as the second light onto the subject's eye and to detect interference light between returning light of the measurement light from the subject's eye and reference light. ### Claim 6 A method of controlling an ophthalmologic apparatus comprising: a refractive power measurement optical system including a first focusing element capable of changing a focal position, and configured to project first light onto a subject's eye and to detect returning light of the first light from the subject's eye via the first focusing element; a fixation projection system configured to project a fixation target onto the subject's eye; and an inspection optical system including a second focusing element capable of changing a focal position in conjunction with the first focusing element, and configured to perform a predetermined inspection in which second light is projected onto at least the subject's eye via the second focusing element, the method comprising: a focusing control step of controlling the first focusing element and the second focusing element based on a detection result of the returning light of the first light, the returning light being obtained by performing provisional measurement using the refractive power measurement optical system in a state where the fixation target is projected onto the subject's eye; an inspection step of controlling the inspection optical system to perform the predetermined inspection after the focusing control step; and a refractive power measurement step of performing refractive power measurement using the first light in a state of promoting a fogging of the subject's eye by controlling the fixation projection system, after the inspection step. ### Claim 7 (depends on 6) The method of controlling the ophthalmologic apparatus of claim 6. wherein the focusing control step is performed to move the first focusing element along an optical axis direction of the refractive power measurement optical system, and to move the second focusing element along the optical axis direction of the inspection optical system. ### Claim 8 (depends on 6) The method of controlling the ophthalmologic apparatus of claim 6, wherein the refractive power measurement step is performed to promote the fogging of the subject's eye by moving a focal position of an image of the fixation target in an optical axis direction of the fixation projection system from a position specified based on the detection result of the returning light. ### Claim 9 (depends on 8) The method of controlling the ophthalmologic apparatus of claim 8, wherein the refractive power measurement step is performed to change a focal position of the image of the fixation target by moving a display unit, which is configured to display the fixation target, in the optical axis direction of the fixation projection system. ### Claim 10 (depends on 6) The method of controlling the ophthalmologic apparatus of claim 6, wherein the inspection step is performed to perform OCT measurement for projecting measurement light as the second light onto the subject's eye and detecting interference light between returning light of the measurement light from the subject's eye and reference light.