,Methods The optometer is composed of singlechip, handle and LCD.The eyesight is examined by selecting exposure of random sample eye-chart mark E within direction keys on the handle.
采用微
控制
检
仪，其由单片、手柄和液晶显示屏构成，手柄具有上下左右
向等功能键，根据手柄上的按键选取随出现标"E"朝向的正确与否来检。
