在屏幕上的字体由墨水形成，与背景形成很高的光学对比度，使之便于阅读。
Letters and other characters on the screen are formed out of ink that has a high optical contrast with the background, making them easy to read.
光学和光学仪器。视觉敏锐度测试。相关的验光字体法。
Optics and optical instruments. visual acuity testing. method of correlating optotypes.
扫描机：把书稿或相片转为数码资料的机器。光学文字识别机是扫描机的一种，它把打字字体或印刷字体转为数码资料。
Scanner: An equipment that converts photographic or hand-drawn original into digital data. An OCR machine can converts typed or printed text into digital data.
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