公开(公告)号：US5331358A

公开(公告)日：1994-07-19

申请号：US879995

申请日：1992-05-08

申请人： Hermann Schurle ,  Wolfgang Grimm ,  Hartmut Mennicke

发明人： Hermann Schurle ,  Wolfgang Grimm ,  Hartmut Mennicke

IPC分类号： A61B3/02 ,  A61B3/032 ,  G02F1/1347 ,  H04N13/00 ,  G02B27/02

CPC分类号： H04N13/0434 ,  A61B3/032 ,  G02F1/13471 ,  H04N13/0422

摘要： A vision testing system includes polarization spectacles having different polarization axes with or without .lambda./4 filters for the two polarization lenses forward of the eye of the patient to be tested. This system also includes a vision testing apparatus for generating light having a specific polarization direction. The vision testing apparatus includes essentially two polarization filters and two LCD-displays which are mounted alternately one behind the other. This arrangement can so influence the light coming from the light source that test figures or portions of the test figures can be seen by one eye or by both eyes. If a test figure is to be changed, then a corresponding command is issued via a key pad to a switching unit which drives two drive circuits of the two LCD-displays in a desired manner. By making appropriate modifications of the vision testing apparatus, a patient can be tested as to color-vision acuity.

摘要翻译： 视力测试系统包括具有不同偏振轴的偏振眼镜，其具有或不具有用于待测试患者的眼睛前方的两个偏振透镜的λ/ 4滤光片。 该系统还包括用于产生具有特定偏振方向的光的视力测试装置。 视觉检测装置基本上包括两个偏振滤光器和两个交替安装在一起的LCD显示器。 这种布置可以影响来自光源的光，测试图形或测试图的部分可以被一只眼睛或两只眼睛看到。 如果要更改测试图，则通过键盘将相应的命令发送到以期望的方式驱动两个LCD显示器的两个驱动电路的切换单元。 通过适当地修改视力测试装置，可以对患者的颜色视力进行测试。