a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem
同义词：asthenopia
eyestrain详细解释
eye.strain n.（名词）Pain and fatigue of the eyes, often accompanied by headache, resulting from prolonged use of the eyes, uncorrected defects of vision, or an imbalance of the eye muscles.眼下疲劳：眼睛的疼痛和疲乏，常伴有头痛，长久使用眼睛所致，或因未矫正的视力缺陷或眼肌的不平衡
