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KMID : 1011420140190040533
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Journal of Korean Ophthalmic Optics Society
2014 Volume.19 No. 4 p.533 ~ p.538
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The Study of Visual Fatigue by Monitor Letter Contrast with an Eye Tracker
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Kim Ha-Rim
Jeong Ju-Hyun
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Abstract
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Purpose: This study is to investigate correlation between eye fatigue and letter contrast according to letter contrast changes on monitor display.
Methods: Reading speed test were carried out for 53 subjects (mean age: 22.68±1.85 years) who have over Best-corrected visual acuity (BCVA) 1.0, and 45 subjects, who could read over 123 out of 163 letters among 53 subjects were selected. They were asked to read the letters which were composed of Black (contrast 100%), Dark gray (contrast 80%), Gray (contrast 80%), Light gray (contrast 30%) randomly. The change of their eye fatigue by letter contrast on monitor display was measured by monitoring their eyes with an eye-tracker while they were reading letters.
Results: Event Duration (sec) was 33.635 for Black, 32.266 Dark gray, 33.936 for Gray, and 34.848 for Light gray. Average of Fixation Duration (sec) was 0.224 for Black, 0.218 for Dark gray, 0.239 for Gray and 0.243 for Light gray. Average of Pupil diameter (mm) was 41.133mm for Black, 41.160 mm for Dark gray, 40.880 mm for Gray and 40.459 mm for Light gray. Frequency (blinks/sec) was 0.211 for Black, 0.206 for Dark gray, 0.221 for Gray, and 0.238 for Light gray.
Conclusions: Event Duration and average of Fixation Duration were the shortest for Dark gray and the longest for Light gray. In average Pupil diameter was the biggest Dark gray and the smallest for Light gray. Blink Frequency (blinks/sec) was the lowest for Dark gray and the highest for Light gray. Visual fatigue by brightness of letters on monitor display was the least for Dark gray followed by Black, Gray and Light gray.
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KEYWORD
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Fatigue, Contrast, Reading speed, Average of fixation duration, Reading error
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