Abstract
This study examined the influence of age-related changes in vision on the requirements for lightness, contrast and character size of reflective liquid-crystal displays (LCDs). Young (n=30,mean age 21.3 years) and old (n=24,mean age 58.6 years) subjects rated 25 lightness and contrast combinations for 5 character sizes displayed on the hard copy that simulate a reflective LCD. The results indicate that the character size is more important factor for old subjects than for young subjects. Old subjects required very high lightness and contrast when the character size is smaller than 15 point (angular character size is about 0.5 degree). These differences between the old subjects and the young subjects may be due to age-related differences in visual acuity for near target.
