title: Blood vitamin "A" level and dark adaptation.
mesh_terms: D000328:Adult; D003623:Dark Adaptation / Q000187:drug effects*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D014801:Vitamin A / Q000097:blood* / Q000494:pharmacology
chemical_list: D014801:Vitamin A