The prevalence of diabetes among 352 Arab patients of two ethnic constitutions (Kuwaiti and non-Kuwaiti) who had cataract extraction in the year 1983 was found to be 21%. The highest prevalence was among Kuwaiti females (28%), which matched that of the general population for the same age, sex, and ethnic constitution. Kuwaiti diabetics required cataract extraction at an earlier age in both sexes, but the difference for non-Kuwaitis was not significant. The annual rate of cataract extraction was higher for Kuwaitis in all age groups and in both sexes compared to non-Kuwaiti Arabs, and females in both groups had a higher rate than males. A high prevalence of presenile cataract extraction in this population, reaching up to 58%, was documented. The presence of diabetes appeared to be a significant risk factor for the Arab female to have cataract extraction but not for the male.