asthenopia
  目力昏倦; 視力疲勞; 眼疲勞
  as·the·no·pia /ˌæsθəˈnopɪə/ 名詞
  眼疲勞,視力疲勞
  As·the·no·pi·a n.  Weakness of sight.  --Quain.  -- As*the*nop*ic a.
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  asthenopia
       n : a tiredness of the eyes caused by prolonged close work by a
           person with an uncorrected vision problem [syn: eyestrain]