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.
采用微计算机控
检测仪，其由单片机、手柄和液晶显示
构成，手柄具有上下左右方向等功能
，
手柄上的按选取随机出现标"E"朝向的正确与否来检测。
