A review of the clinical records of 1,543 American Indians revealed that malignant melanoma occurs less commonly among American Indians than in the general population (not a single case in the records reviewed); that primary open-angle glaucoma and inferotemporal dialysis occur with approximately the same frequency as in the general population; and that trachoma, retinoblastoma, phakomorphic angle-closure glaucoma, and iridocyclitis associated with active pulmonary tuberculosis occur more commonly; retinoblastoma had a strikingly greater prevalence, occurring six times more frequently than in the general population. Mature cataracts and phakolytic glaucoma may occur more commonly in Indians, and some diseases have a tribal predilection.
Bettman JW. Eye Disease Among American Indians of the SouthwestI. Overall Analysis. Arch Ophthalmol. 1972;88(3):263-268. doi:10.1001/archopht.1972.01000030265009