目前的视力表都是采用方形设计,测试符号呈一行行有序排列,位置较为固定,一些人采取背诵符号的办法作弊,使得检测的结果不真实,也不利于视力保护。据说有一种采用电脑控制随机产生符号的视力检测设备,我没有得到证实,即便有,价格想必也很昂贵。于是,我产生了用比较简单、巧妙、 Current visual acuity chart are used square design, the test symbols were arranged in a row, the location is relatively fixed, some people to recite the symbol to cheat, making the test results are not true, is not conducive to the protection of eyesight. It is said that there is a vision testing device that uses computer-generated symbols to generate random signs, I have not been confirmed, if any, the price must be very expensive. So, I produced a relatively simple, clever,