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STUDY OF STRABISMUS USING A VIRTUAL REALITY SYSTEM

使用虚拟现实系统研究斜视

基本信息

批准号：
05454471
负责人：
KANI Kazutaka
金额：
$ 4.42万
依托单位：
Shiga University of Medical Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05454471/
关键词：
Stereopsis Binocular parallax Reversed binocular parallax Virtual reality Head mounted display Stereoscopic key Strabismus Ring and hook test 両眼視眼球運動逆立体 Fundus Haploscope

项目摘要

The function of the visual system is to perceive the three dimensional world as two dimensional retinal images and to reconstruct it using stereoscopic keys such as binocular parallax, size, shadows, shades, textures, motion, etc. The purpose of this study is to clarify which of these keys are used under which conditions by normal or strabismic patients.A head mounted display (HMD) was made, which was composed of liquid crystal display panels (LCD) and eye position/movement monitoring systems using infrared video camera. Two CCD color video cameras whose field of vision was similar to those of the LCD screens, were attached to the HMD at intervals of 65 mm. Each camera was connected to one LCD screen so that the image projected was the same as the subjects were seeing. Wearing the HMD the subjects could see normally. Changing the connections between video cameras and screens, the normal binocular parallax, reversed parallax or non parallax were created.Normal and strabismic subjects were investigated. Stereoscopic tests were performed under normal and reversed binocular parallax.Normal subjects felt normal stereopsis with normal binocular parallax. The could correctly recognize the stereoscopic shape with reversed parallax of the objects were familiar for the subjects such as books, faces, desks or chairs. They were confused when they saw complicated things such as tangled ropes, and they failed ring and hook test in this condition. Strabismic subjects could almost correctly recognize the stereoscopic shape with both normal and reversed parallax. They passed the ring and hook test only when the ring was moving in both normal and reversed parallax conditions.It is suggested that strabismic patients used monocular stereoptic keys more than normal persons to supplement their lack of binocular rarallax perception.

视觉系统的功能是将三维世界感知为二维视网膜图像，并使用立体键（如双眼视差、大小、阴影、阴影、纹理、运动等）对其进行重建。本研究的目的是阐明正常或斜视患者在何种条件下使用这些键中的哪些键。制作了头戴式显示器（HMD），它由液晶显示面板组成 (LCD) 和使用红外摄像机的眼睛位置/运动监控系统。两个 CCD 彩色摄像机的视野与 LCD 屏幕的视野相似，以 65 毫米的间隔安装在 HMD 上。每个摄像头都连接到一个液晶屏幕，以便投影的图像与受试者看到的图像相同。佩戴头戴式显示器的受试者可以正常看到。改变摄像机和屏幕之间的连接，产生正常的双眼视差、反向视差或无视差。对正常和斜视受试者进行了研究。立体测试在正常和反向双眼视差下进行。正常受试者在正常双眼视差下感受到正常的立体视觉。能够正确识别具有反向视差的物体的立体形状，对于书籍、面孔、桌子或椅子等物体来说是熟悉的。当他们看到复杂的东西，比如纠缠的绳子时，他们感到很困惑，在这种情况下他们没有通过环钩测试。斜视受试者几乎可以正确识别正常视差和反向视差的立体形状。只有当环在正常视差和反向视差条件下移动时，他们才通过环钩测试。这表明斜视患者比正常人更多地使用单眼立体视键来补充其双眼视差知觉的缺乏。