The rapid development of technology over the years has brought about some revolutionary changes, especially in human-computer interaction (HCI). This study suggested a reusable catalog of usability evaluation methods, eye tracking for user testing and a questionnaire for inquiry as suitable usability evaluation methods, a uniform metrics to measure font size (visual angle of font) in arcminutes and parameters to consider when investigating font size for older adults to ensure consistency in future studies. Inconsistencies in evaluation methods and experimental procedures were observed in the selected articles. However, there exists a critical size at which readability declines. Results suggest that older adults preferred larger font sizes. An inclusion criterion was used to remove duplicates and avoid inconsistencies. Studies were selected from databases GOOGLE SCHOLAR, WEB OF SCIENCE, PUBMED, and SCIENCE DIRECT. This study used a systematic review of previous and existing relevant research on font size for older adults and research on the psychophysics of reading and analyzed the outcomes based on reading time/speed, readability, legibility and the usability evaluation methods employed. With the global society aging, it is necessary to investigate suitable font size based on reading time/speed, readability and legibility for older adults.
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