# US 9,750,405 B2 · Automated detection of eye alignment > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,750,405 B2 - Document ID: US9750405B2 - Status: Granted - Kind: B2 - Application number: 14/950,968 - Filed: 2015-11-24 - Published: 2016-03-17 - Granted: 2017-09-05 - Earliest claimed: 2013-11-07 - Assignees: Ohio State Innovation Foundation - Applicants: Ohio State Innovation Foundation - Inventors: Melissa Diane Bailey - Web page: https://patentgrep.com/patent/US9750405B2 ## CPC - A61B 3/113: for determining or recording eye movement - A61B 3/0025: {characterised by electronic signal processing, e.g. eye models} - A61B 3/0091: {Fixation targets for viewing direction} - A61B 3/08: for testing binocular or stereoscopic vision, e.g. strabismus - A61B 3/085: {for testing strabismus} - A61B 3/103: for determining refraction, e.g. refractometers or skiascopes - A61B 3/14: Arrangements specially adapted for eye photography - A61B 3/145: {by video means} - A61B 3/152: {for aligning} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract An example method for automatically measuring a subject's phoria while the subject fixates on a visual target can include capturing an image of at least one of the subject's eyes using an image capturing device after covering and uncovering the at least one of the subject's eyes. The image can include a reflection of light from at least one of the subject's eyes. The method can also include analyzing the image to identify a position of the reflection of the light within at least one of the subject's eyes, and determining a phoria measurement based on the position of the reflection of the light within at least one of the subject's eyes. ## Claims ### Claim 1 A method for automatically measuring a subject's phoria while the subject fixates on a visual target, comprising: covering and uncovering at least one of the subject's eyes; capturing a sequence of images of the at least one of the subject's eyes after uncovering the at least one of the subject's eyes using an image capturing device, a first image of the sequence of images including a first reflection of light from the at least one of the subject's eyes and a second image of the sequence of images including a second reflection of light from the at least one of the subject's eyes, wherein the first image and the second image are captured at different times after uncovering the at least one of the subject's eyes; comparing a position of the first reflection of the light within the first image of the sequence of images to a position of the second reflection of the light within the second image of the sequence of images to determine a magnitude and a direction of any movement after the at least one of the subject's eyes is uncovered; and determining a phoria measurement based on the determined magnitude and direction of the movement after the at least one of the subject's eyes is uncovered. ### Claim 2 (depends on 1) The method of claim 1, wherein the first image and the second image includes at least two reflections of the light from at least two of an outer or inner surface of a cornea or an outer or inner surface of a lens of at least one of the subject's eyes. ### Claim 3 (depends on 1) The method of claim 1, further comprising illuminating at least one of the subject's eyes with a light using a light source to create the reflection. ### Claim 4 A method for automatically measuring a subject's phoria while the subject fixates on a visual target, comprising: covering and uncovering at least one of the subject's eyes; illuminating the at least one of the subject's eyes with at least two lights using at least two light sources; capturing a sequence of images of the at least one of the subject's eyes after uncovering the at least one of the subject's eyes using an image capturing device, the sequence of images including a first image and a second image including reflections of the at least two lights from at least one of the subject's eyes; analyzing the first image and the second image to identify respective positions of the reflections of the at least two lights within the at least one of the subject's eyes; and determining a phoria measurement based on the respective positions of the reflections of the at least two lights within the at least one of the subject's eyes. ### Claim 5 (depends on 4) The method of claim 4, further comprising capturing a second sequence of images of another one of the subject's eyes and comparing respective positions of the reflections of the at least two lights within one of the subject's eyes in the first image and the second images and respective positions of reflections of the at least two lights within a first image of the second sequence of images and a second image of the second sequence of images, wherein the phoria measurement is determined based on a result of the comparison. ### Claim 6 (depends on 4) The method of claim 4, wherein the first image and the second image includes reflections of the at least two lights from at least one of an outer or inner surface of a cornea or an outer or inner surface of a lens of the at least one of the subject's eyes. ### Claim 7 A method for automatically measuring a subject's phoria while the subject fixates on a visual target, comprising: covering and uncovering at least one of the subject's eyes; capturing a sequence of images of the at least one of the subject's eyes after uncovering the at least one of the subject's eyes using an image capturing device, the sequence of images including a landmark within at least one of the subject's eyes; analyzing a first image of the sequence of images and a second image of the sequence of images to identify a position of the landmark within the at least one of the subject's eyes; and determining a phoria measurement based on a determined magnitude and direction of movement of a position of the landmark within the at least one of the subject's eyes as determined between the first and second images. ### Claim 8 (depends on 7) The method of claim 7, wherein the landmark is a feature within the at least one of the subject's eyes. ### Claim 9 (depends on 8) The method of claim 8, wherein the feature is a blood vessel.