The effects of font type and size on the legibility and reading time of online text by older adults
CHI '01 Extended Abstracts on Human Factors in Computing Systems
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This study intends to do experiment on legibility of different Thai letter sizes of 32 Thai young and older adults. Both groups do the same procedure. Legibility of Thai letters experiment consists of 2 measurements; visual acuity measurement and 120 trials for legibility test at viewing distances of 0.5 and 2.0 m. Results showed that the minimum legible font size estimated from correct response and legibility evaluation in young adults were less than older adults on both of viewing distances. As the minimum legible font sizes estimated from correct response at the viewing distance of 0.5 m. could be calculated approximately 0.7 to 1.25 mm. in young adults and 2.0 mm. for all of font types in older adults. Whereas the minimum legible font sizes estimated from legibility evaluation at the same viewing distance could be calculated approximately 2.0 mm. in both groups. Similarly, at the viewing distance of 2.0 m., the minimum legible font sizes estimated from correct response could be calculated approximately 2.9 to 3.4 mm. in young adults and 4.7 to 6.3 mm. in older adults. While the minimum legible font sizes estimated from legibility evaluation at the same viewing distance could be calculated approximately 3.6 to 5.3 mm. in young adults and 4.7 to 6.3 mm. in older adults which were equivalent to correct response estimation. Consequently, the present study provides the preliminary data of minimum legible font size for Thai characters that could be used as guidelines for developing the standardization of Thai font size for design fonts on products services and environments for younger and older adults.