Steady-state accommodation response was measured for seven different visual display terminal (VDT) screen conditions and a hard-copy control condition. The screen conditions included variations in screen polarity, contrast and chromatic characteristics of the text and background. Accomodation response was measured for seven young subjects using a free-space infrared optometer, the Canon Autoref R-1. The accomodation response was measured every 1.3 s over a period of 60 s for each test condition, and both the mean and standard deviation of the responses were derived. A small but significantly higher accomodation response was found for hard copy, blue-on-red and red-on-blue screen conditions compared with white-on-black, green-on-black and black-on-white screen conditions. Screen polarity and contrast had little effect on accomodation response for the black-and-white screen conditions. The variability of accommodation response showed little difference between test conitions. For short-term VDT screen viewing, the accomodation response appears to be relatively accurate and stable across a wide range of screen conditions
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