Abstract
Whittaker and Lovie-Kitchin (1993) refer to the ratio of text character size to acuity threshold character size as acuity reserve (AR). Most studies of reading with normally sighted subjects have used character sizes about 4× the acuity threshold of the participants (0.33 deg). This is slightly larger than newspaper print (an 'x' measures approximately 1.8 mm) read from 40 cm, and Rubin and Turano (1992) have shown that varying the character size from 2 to 30× acuity threshold has almost no effect on reading rate from a computerized page display.
© 1996 Optical Society of America
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