Strabismus detection

An image and light source technology, applied in the field of strabismus detection, which can solve problems such as impracticality

Inactive Publication Date: 2015-05-27
IRISS MEDICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is also a fairly high skill test and therefore impractical for many testing scenarios such as testing all preschool children in a given geographic area

Method used

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  • Strabismus detection
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Embodiment Construction

[0042] In general, disclosed herein are methods, devices, and systems for detecting strabismus in an image of a subject's eye captured by a camera using a light source and a target offset from the light source. The offset target provides a suitable focus for the subject, who can be instructed (or attracted by light and / or sound) to look towards the target when the image is captured. By knowing the relative positions of the subject, light source and target, reference data can be determined which can be compared with data determined from captured images in order to detect strabismus.

[0043] During the manual Hessberg test, the subject focuses on a light source directly in front of them, and the clinician evaluates the relative separation in each eye between the point of reflection of the light source and the center of the pupil. This process can be automated by capturing images and implementing image processing techniques. The inventors have realized that this type of strabis...

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Abstract

A method for detecting strabismus in at least one image comprising a subject's eyes, wherein the at least one image has been obtained using an apparatus comprising a light source and a target offset from the light source, the method comprising, for each of the subject's left and right eyes: determining, from the image, a reflection offset distance, being the distance between a reference point of the eye and a reflection of a light source on the eye; determining a difference between the reflection offset distance and a reference reflection offset distance for the corresponding left or right eye, wherein the reference reflection offset distance has been determined based on relative positions of the light source, the target and the subject's head; and determining whether the difference is less than a difference threshold value for determining whether the subject has a strabismus.

Description

technical field [0001] The present invention relates to methods, devices and systems for detecting strabismus in images of eyes of a subject. Background technique [0002] Detection of a subject's strabismus is usually performed manually. In this case, the subject's eyes were assessed by a trained clinician using the "Hirschberg test," which is used to check whether the pupils of the eyes are in focus. An accepted, but crude test of symmetry when looking at an object directly in front of it. [0003] Broadly speaking, the Hessberg test is performed by shining light at the subject's eye from a light source located directly in front of the eye and having the patient focus on the light or an object that happens to be in close proximity to it, And observe whether the distance between the reflection point of the light and the center of the pupil appears to be the same in size and direction in both eyes. [0004] Small differences on each eye of a subject are difficult to manua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/113
CPCA61B3/113F04C2270/0421A61B3/085A61B3/0008A61B3/14
Inventor 罗恩·乌列·马奥尔奈杰尔·安德鲁·西蒙·巴纳德尤瓦尔·亚希夫
Owner IRISS MEDICAL TECH
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