# US 9,867,532 B2 · System for detecting optical parameter of eye, and method for detecting optical parameter of eye > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,867,532 B2 - Document ID: US9867532B2 - Status: Granted - Kind: B2 - Application number: 14/781,306 - Filed: 2013-12-04 - Published: 2016-05-19 - Granted: 2018-01-16 - Earliest claimed: 2013-07-31 - Assignees: Beijing Zhigu Rui Tuo Tech Co., Ltd - Applicants: Beijing Zhigu Rui Tuo Tech Co., Ltd - Inventors: Lin Du; Hongjiang Zhang - Web page: https://patentgrep.com/patent/US9867532B2 ## CPC - A61B 3/0025: {characterised by electronic signal processing, e.g. eye models} - A61B 3/0075: {provided with adjusting devices, e.g. operated by control lever} - A61B 3/113: for determining or recording eye movement - A61B 3/12: for looking at the eye fundus, e.g. ophthalmoscopes (A61B3/13 takes precedence) - A61B 3/14: Arrangements specially adapted for eye photography - A61B 2560/0223: of calibration, e.g. protocols for calibrating sensors - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract An optical parameter of an eye is detected using an image collection apparatus that collects an image presented by a fundus. An imaging apparatus adjusts an imaging parameter of an optical path between an eye and the image collection apparatus, wherein the image collection apparatus obtains a clearest image that satisfies a defined clarity criterion or condition. An image processing apparatus processes the clearest image to obtain an optical parameter of the eye. The image of the fundus is captured, and an imaging parameter known in the optical path when the clearest image is captured is found, so that a direction currently being watched by the eye and a distance between the eye and a focusing point can be obtained through optical calculation. Consequently, a position of the focusing point of the eye can be determined precisely for a wide range of concurrent applications for eye control interaction. ## Claims ### Claim 1 A system, comprising: an image collection apparatus configured to collect at least one image presented by a fundus of an eye; an imaging apparatus configured to adjust at least one imaging parameter of an optical path between the eye and the image collection apparatus, wherein the image collection apparatus obtains an image of the at least one image that satisfies at least a defined clarity criterion; and an image processing apparatus configured to process the image to obtain at least one optical parameter of the eye in response to the image collection apparatus obtaining the image that satisfies at least the defined clarity criterion, wherein the image processing apparatus comprises a parameter calculation module configured to determine the at least one optical parameter of the eye according to the image that satisfies the at least the defined clarity criterion and the at least one imaging parameter corresponding to a time when the image that satisfies the at least the defined clarity criterion was obtained. ### Claim 2 (depends on 1) The system according to claim 1, wherein the image processing apparatus further comprises: an image analyzing module configured to analyze the at least one image collected by the image collection apparatus to find a clearest image of the at least one image relative to the defined clarity criterion; wherein the parameter calculation module is configured to determine the at least one optical parameter of the eye according to the clearest image and the at least one imaging parameter corresponding to a time when the clearest image was obtained. ### Claim 3 (depends on 2) The system according to claim 2, wherein the image processing apparatus further comprises: an image calibration module configured to obtain at least one reference image corresponding to the at least one image presented by the fundus. ### Claim 4 (depends on 3) The system according to claim 3, wherein the image analyzing module is further configured to compare the at least one image collected by the image collection apparatus and the at least one reference image to obtain the clearest image. ### Claim 5 (depends on 2) The system according to claim 2, wherein the parameter calculation module is further configured to obtain a position of a focusing point of the eye according to the at least one optical parameter of the eye. ### Claim 6 (depends on 2) The system according to claim 2, wherein the parameter calculation module comprises: an eye optical axis direction determination unit configured to obtain an eye optical axis direction according to a feature of the eye in response to the clearest image being obtained. ### Claim 7 (depends on 6) The system according to claim 6, wherein the eye optical axis direction determination unit comprises: a first determination subunit configured to obtain the eye optical axis direction according to a feature of the fundus in response to the clearest image being obtained. ### Claim 8 (depends on 6) The system according to claim 6, wherein the eye optical axis direction determination unit comprises: a second determination subunit configured to obtain the eye optical axis direction according to a feature of a pupil of the eye in response to the clearest image being obtained. ### Claim 9 (depends on 6) The system according to claim 6, wherein the image processing apparatus further comprises: an eye optical axis direction calibration module configured to calibrate the eye optical axis direction. ### Claim 10 (depends on 2) The system according to claim 2, further comprising: a casting apparatus configured to cast a light spot to the fundus. ### Claim 11 (depends on 10) The system according to claim 10, wherein the light spot cast by the casting apparatus comprises a pattern. ### Claim 12 (depends on 10) The system according to claim 10, wherein the casting apparatus is an infrared light spot casting apparatus. ### Claim 13 (depends on 12) The system according to claim 12, wherein an emergent surface of the casting apparatus is provided with an eye invisible light transmission filter. ### Claim 14 (depends on 12) The system according to claim 12, wherein an incident surface of the image collection apparatus is provided with an eye invisible light transmission filter. ### Claim 15 (depends on 10) The system according to claim 10, wherein the image processing apparatus further comprises: a casting control module configured to control, according to a result obtained by the image analyzing module, a brightness of the light spot cast by the casting apparatus. ### Claim 16 (depends on 1) The system according to claim 1, wherein the imaging apparatus comprises: an adjustable lens unit, located in the optical path between the eye and the image collection apparatus, wherein a focal length of the adjustable lens unit is adjustable or a position of the adjustable lens unit in the optical path is adjustable. ### Claim 17 (depends on 16) The system according to claim 16, wherein the adjustable lens unit comprises: a focal length adjustable lens, having the focal length or alternatively having a different focal length, configured to adjust the focal length or alternatively the different focal length by adjusting a refractive index and/or shape of the focal length adjustable lens. ### Claim 18 (depends on 16) The system according to claim 16, wherein the adjustable lens unit comprises: a lens set configured to adjust a relative position between at least two lenses in the lens set to adjust another focal length of the lens set. ### Claim 19 (depends on 1) The system according to claim 1, wherein the imaging apparatus further comprises: a light splitting apparatus configured to form a first light transferring path between the eye and a viewed object, and a second light transferring path between the eye and the image collection apparatus. ### Claim 20 (depends on 19) The system according to claim 19, wherein the light splitting apparatus comprises: a first light splitting unit, located between the eye and the viewed object, and configured to transmit light from the viewed object to the eye, and transfer light from the eye to the image collection apparatus. ### Claim 21 (depends on 20) The system according to claim 20, wherein the first light splitting unit is a beam splitter or a light splitting optical waveguide. ### Claim 22 (depends on 21) The system according to claim 21, wherein the first light splitting unit is a curved beam splitter configured to transfer, to the image collection apparatus, the at least one image presented by the fundus, and wherein the at least one image respectively correspond to at least one position of a pupil associated with different eye optical axis directions. ### Claim 23 (depends on 1) The system according to claim 1, wherein the system is a wearable optical device comprising the image collection apparatus, the imaging apparatus, and the image processing apparatus. ### Claim 24 A method, comprising: collecting at least one image presented by a fundus of an eye; adjusting at least one imaging parameter of an optical path between the eye and an image collection apparatus to collect an image of the at least one image that at least satisfies a defined clarity condition; and processing the image to obtain at least one optical parameter of the eye in response to the image being determined to satisfy the defined clarity condition, wherein the processing the image to obtain the at least one optical parameter of the eye comprises calculating the at least one optical parameter of the eye according to the image that satisfies the defined clarity condition and the at least one imaging parameter known from the optical path in response to the image that satisfies the defined clarity condition being obtained. ### Claim 25 (depends on 24) The method according to claim 24, wherein the processing the image to obtain the at least one optical parameter of the eye further comprises: analyzing the at least one image to find a clearest image; and calculating the at least one optical parameter of the eye according to the clearest image and the at least one imaging parameter known in the optical path in response to the clearest image being obtained. ### Claim 26 (depends on 25) The method according to claim 25, further comprising: before the processing of the image, calibrating the at least one image of the fundus to obtain at least one reference image corresponding to the at least one image presented by the fundus. ### Claim 27 (depends on 26) The method according to claim 26, wherein the analyzing the at least one image to find the clearest image comprises: comparing the at least one image and the at least one reference image to obtain the clearest image. ### Claim 28 (depends on 25) The method according to claim 25, further comprising: obtaining a position of a focusing point of the eye according to the at least one optical parameter of the eye. ### Claim 29 (depends on 25) The method according to claim 25, wherein the calculating the at least one optical parameter of the eye according to the clearest image and the at least one imaging parameter known in the optical path in response to the clearest image being obtained comprises: obtaining an eye optical axis direction according to a feature of the eye in response to the clearest image being obtained. ### Claim 30 (depends on 29) The method according to claim 29, further comprising: calibrating the eye optical axis direction before the eye optical axis direction is obtained according to the feature of the eye. ### Claim 31 (depends on 25) The method according to claim 25, wherein the calculating the at least one optical parameter of the eye according to the clearest image and the at least one imaging parameter known in the optical path in response to the clearest image being obtained comprises: obtaining the eye optical axis direction according to a feature of the fundus in response the clearest image being obtained. ### Claim 32 (depends on 25) The method according to claim 25, wherein the calculating the at least one optical parameter of the eye according to the clearest image and the at least one imaging parameter known in the optical path in response to the clearest image being obtained comprises: obtaining the eye optical axis direction according to a feature of a pupil of the eye in response to the clearest image being obtained. ### Claim 33 (depends on 25) The method according to claim 25, further comprising: casting a light spot to the fundus. ### Claim 34 (depends on 33) The method according to claim 33, wherein the light spot comprises a defined pattern. ### Claim 35 (depends on 33) The method according to claim 33, wherein the light spot is an infrared light spot. ### Claim 36 (depends on 35) The method according to claim 35, wherein the light spot cast to the fundus is directed through a filter that blocks visible light transmission. ### Claim 37 (depends on 35) The method according to claim 35, wherein the at least one image is filtered by an eye invisible light transmission filter. ### Claim 38 (depends on 33) The method according to claim 33, further comprising: controlling a brightness of the light spot according to a result obtained by analyzing the at least one image. ### Claim 39 (depends on 24) The method according to claim 24, wherein the at least one imaging parameter of the optical path between the eye and the image collection apparatus is adjusted in a manner of adjusting a focal length of a lens unit in the optical path between the eye and the image collection apparatus or a position of the lens unit in the optical path. ### Claim 40 (depends on 24) The method according to claim 24, wherein the collecting the at least one image presented by the fundus comprises: collecting images presented by the fundus that respectively correspond to positions of a pupil associated with different eye optical axis directions. ### Claim 41 A computer readable storage device comprising executable instructions that, in response to execution, cause a wearable optical apparatus comprising a processor to perform operations, comprising: receiving at least one image of a fundus of an eye; determining an image of the at least one image that at least satisfies a defined clarity characteristic, wherein the determining comprises modifying at least one imaging parameter of an optical path between the eye and an image collection apparatus; and processing the image to obtain at least one optical parameter of the eye in response to the image being determined to satisfy the defined clarity characteristic, wherein the processing the image to obtain the at least one optical parameter of the eye comprises determining the at least one optical parameter of the eye based on information represented by the image that satisfies the defined clarity characteristic and the at least one imaging parameter of the optical path in response to the image that satisfies the defined clarity characteristic being determined. ### Claim 42 (depends on 41) The computer readable storage device according to claim 41, wherein the processing the image to obtain the at least one optical parameter of the eye further comprises: analyzing the at least one image to determine a clearest image; and determining the at least one optical parameter of the eye based on information represented by the clearest image and the at least one imaging parameter of the optical path in response to the clearest image being determined.