title: The monofixation syndrome: heterophoria and asthenopia.
mesh_terms: D000293:Adolescent; D000328:Adult; D001248:Asthenopia; D002648:Child; D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D008297:Male; D013285:Strabismus; D013577:Syndrome; D014786:Vision Disorders