Abstract
The purpose of the present study is to compare older and young adults visual fatigue and performance in the use of Thin Film Transistor Liquid Crystal Display (TFT-LCD). An experiment with age (older vs. young) and display polarity (positive vs. negative) both as between-group factors was first conducted to determine the optimal display background. In the experiment, visual fatigue was measured by critical flicker fusion (CFF) and visual performance was measured by the hit rate of searching target characters. The results showed that the negative polarity resulted in less fatigue and higher searching hit rate, particularly for the older subject. A second experiment with all test materials displayed in negative polarity was subsequently conducted where age (old vs. young), font size (12 vs. 14 points), and line spacing (single vs. double) were designed as the factors. The ANOVA showed that visual searching performance with double spacing outperformed the single counterpart across all conditions. In addition, the interaction between age and font size was significant and further post hoc analysis revealed that 14-font size outperformed the 12 counterpart but the advantage reduced when the older subject was tested. Implications for the design of TFT-LCD with age-difference considerations were discussed.
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