Abstract
A software package was developed for an Apple-II microcomputer to display Snellen letters as test charts for high speed measurement of visual acuity. With direct viewing of a 30 cm (12 inch) monitor, letter sizes can range from 6/100 to 6/6. This range can be extended by using a modified monitor to display reversed letters for indirect viewing, to increase the testing distance. To circumvent patient learning, random presentation order of different charts (recalled rapidly from diskette) can be used. The video charts were compared with a Bailey-Lovie (IogMAR) Snellen chart by duplicating the letter sizes and format. Acuities were on average one line less for the video chart compared to the wall chart.
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