# US 9,504,383 B2 · Detection of an oculomotor abnormality in a patient by means of a visual search test > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,504,383 B2 - Document ID: US9504383B2 - Status: Granted - Kind: B2 - Application number: 14/236,650 - Filed: 2012-08-10 - Published: 2014-08-14 - Granted: 2016-11-29 - Earliest claimed: 2011-08-11 - Assignees: E(Ye)Brain - Applicants: Magali Seassau; Serge Kinkingnehun - Inventors: Magali Seassau; Serge Kinkingnehun - Web page: https://patentgrep.com/patent/US9504383B2 ## CPC - A61B 3/113: for determining or recording eye movement - A61B 5/16: Devices for psychotechnics (using teaching or educational appliances G09B1/00 - G09B7/00); Testing reaction times {; Devices for evaluating the psychological state} - A61B 5/163: {by tracking eye movement, gaze, or pupil change} - A61B 3/028: for testing visual acuity; for determination of refraction, e.g. phoropters - A61B 3/085: {for testing strabismus} - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) ## Abstract The visual search test makes it possible to establish a parameter for binocular coordination that is useful for detecting an oculomotor abnormality, in particular in the context of detecting dyslexia. A system for assisting in the detection is also described. ## Claims ### Claim 1 A test method for establishing a parameter of binocular coordination in a subject, comprising: subjecting the subject to a visual search task for occurrences of a symbol within a succession of symbols; during said visual search task, recording the movements of the subject's two eyes using a device for tracking eye movements; then determining, using a digital processing device, the value of at least one parameter of binocular coordination from the recordings obtained. ### Claim 2 (depends on 1) The method according to claim 1, in which at least one parameter of binocular coordination comprises at least one parameter of binocular disconjugacy in amplitude. ### Claim 3 (depends on 2) The method according to claim 2, in which at least one parameter of binocular disconjugacy comprises a parameter of disconjugacy during saccades representative of a difference in movement between the two eyes during displacement of said eyes from one symbol to another. ### Claim 4 (depends on 2) The method according to claim 2, in which at least one parameter of binocular disconjugacy comprises a parameter of disconjugacy of post-saccadic fixation period representative of a difference in movement between the two eyes during fixation of a symbol. ### Claim 5 (depends on 1) The method according to claim 1, in which determination of the value of at least one parameter of binocular coordination comprises identification, by the digital processing device, of saccades and of post-saccadic fixations on the recordings, and comprises calculation of the at least one parameter of binocular coordination as a function of the saccades and post-saccadic fixations identified. ### Claim 6 (depends on 5) The method according to claim 5, in which at least one parameter of binocular coordination is representative of an average of several saccades or several post-saccadic fixations. ### Claim 7 (depends on 6) The method according to claim 6, in which determination of at least one parameter of binocular conjugacy in amplitude from the recordings includes comparison of the parameter of conjugacy with at least one threshold value. ### Claim 8 (depends on 7) The method according to claim 7, in which the following parameters are determined from the recordings and compared with threshold values: a parameter of disconjugacy during saccades in amplitude, a parameter of disconjugacy of post-saccadic fixation period in amplitude, a parameter of conjugacy of post-saccadic fixation period in amplitude, a duration of post-saccadic fixation period. ### Claim 9 A system for assisting the detection of an oculomotor abnormality in a subject, comprising: a testing module for subjecting the subject to a visual search task for occurrences of a symbol within a succession of symbols; a module for tracking eye movements configured for recording, during said visual search task, the movements of the subject's two eyes; a digital processing module configured for determining the value of at least one parameter of binocular coordination from the recordings; a module for comparing the value determined with at least one threshold value so as to determine an oculomotor abnormality. ### Claim 10 (depends on 9) A method for diagnosing an oculomotor disorder, comprising: providing a system as recited in claim 9; subjecting the subject to a visual search task for occurrences of a symbol within a succession of symbols; recording, during said visual search task, the movements of the subject's two eyes; determining the value of at least one parameter of binocular coordination from the recordings; comparing the value determined with at least one threshold value so as to determine an oculomotor abnormality. ### Claim 11 (depends on 3) The method according to claim 3, in which at least one parameter of binocular disconjugacy comprises a parameter of disconjugacy of post-saccadic fixation period representative of a difference in movement between the two eyes during fixation of a symbol. ### Claim 12 (depends on 9) The system according to claim 9, wherein at least one parameter of binocular coordination comprises at least one parameter of binocular disconjugacy in amplitude. ### Claim 13 (depends on 12) The system according to claim 12, wherein at least one parameter of binocular disconjugacy comprises a parameter of disconjugacy during saccades representative of a difference in movement between the two eyes during displacement of said eyes from one symbol to another. ### Claim 14 (depends on 12) The system according to claim 12, wherein at least one parameter of binocular disconjugacy comprises a parameter of disconjugacy of post-saccadic fixation period representative of a difference in movement between the two eyes during fixation of a symbol. ### Claim 15 (depends on 9) The system according to claim 9, wherein determination of the value of at least one parameter of binocular coordination comprises identification, by the digital processing device, of saccades and of post-saccadic fixations on the recordings, and comprises calculation of the at least one parameter of binocular coordination as a function of the saccades and post-saccadic fixations identified. ### Claim 16 (depends on 15) The system according to claim 15, wherein at least one parameter of binocular coordination is representative of an average of several saccades or several post-saccadic fixations. ### Claim 17 (depends on 16) The system according to claim 16, wherein determination of at least one parameter of binocular conjugacy in amplitude from the recordings includes comparison of the parameter of conjugacy with at least one threshold value. ### Claim 18 (depends on 17) The system according to claim 17, wherein the following parameters are determined from the recordings and compared with threshold values: a parameter of disconjugacy during saccades in amplitude, a parameter of disconjugacy of post-saccadic fixation period in amplitude, a parameter of conjugacy of post-saccadic fixation period in amplitude, a duration of post-saccadic fixation period.