[The effect of treatment position on total body fatigue as seen in eye fatigue in 50-year-olds].
D000065:Accommodation, Ocular; D000328:Adult; D003815:Dentists; D005221:Fatigue / Q000209:etiology*; D006801:Humans; D008029:Lighting; D008875:Middle Aged; D009784:Occupational Diseases / Q000209:etiology*