title: Mydriasis and heredity.
abstract: Routine ophthalmoscopy and fundoscopy of 673 individuals revealed 42 whose irides failed to dilate to a clinically useful degree within 25 to 30 min after the administration of drops of 1% mydracil. These individuals occurred with different frequency among the Aymara, Mestizo, and non-Aymara groups which made up the sample of examinees. The phenomenon was most common among the Aymara, less common among the Mestizos, and least common among the non-Aymara. Distribution of affected individuals within the three groups suggests that the trait is inherited.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D002677:Chile; D005127:Eye Color; D005260:Female; D005654:Fundus Oculi; D005826:Genetics, Medical; D006801:Humans; D007199:Indians, South American; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D009184:Mydriatics / Q000494:pharmacology*; D009887:Ophthalmoscopy; D011680:Pupil / Q000187:drug effects*
chemical_list: D009184:Mydriatics