Influence of a Glasses-type Wearable Device on Visual Function and Eye Fatigue

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  • 眼鏡型ウェアラブル端末が視機能と眼疲労に及ぼす影響

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Purpose: The purpose of this study was to investigate the influence of a glasses-type wearable device on visual function and eye fatigue, both before and after picture viewing.<br>Subjects and Methods: The subjects were 10 healthy adults with an average age of 29.8, age range 23-42years old, and a male/female ratio 3: 7. A glasses-type wearable device was used with a monocular see-through display (made by Konica Minolta) which incorporated a holographic optical element, and two experiments were performed.<br>Experiment1: We set the background brightness of the liquid crystal display to 200 cd/m2. The subjects watched a still picture, with the projection brightness set at 200 cd/m2, 400 cd/m2, and 800 cd/m2 for 15 minutes each. They also watched a video with a brightness of 200 cd/m2 for 1 hour.<br>Experiment2: We set the background brightness of the liquid crystal display to 400 cd/m2. The subjects watched a still picture, with the projection brightness set at 400 cd/m2, 800 cd/m2, and 1,600 cd/m2 for 15 minutes each.<br>The visual function was assessed considering the objective refraction, functional visual acuity, and functional accommodation. In addition, a survey was conducted with a questionnaire related to the subjective symptoms of asthenopia.<br>Results: There were no statistically significant differences in either experiments 1 or 2, either before or after the viewing of the video or still picture. For the subjective symptoms, the scores related to the degree of fatigue was high when the subjects watched the video, but there were no significant differences.<br>Conclusions: In this study, the viewing of a video with a glasses-type wearable device did not affect the visual function of the subjects and asthenopia did not occur.

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