An experimental study on visual strain and microscopy work.
D000065:Accommodation, Ocular; D001248:Asthenopia / Q000150:complications / Q000209:etiology*; D001251:Astigmatism / Q000150:complications; D006653:Histology; D006801:Humans; D008853:Microscopy; D009784:Occupational Diseases / Q000209:etiology