作者谓此为第一次在印度人口中进行色盲调查。色盲通常为先天缺陷,但亦有继发于各种眼部疾患者。Francois 及 Verriest 认为人类的辨色异常系由于偶然突变,而非远祖遗传所致。根据数年前某些欧洲学者统计,人口中约7—8%患色盲。欧美人以外之 The authors claim this is the first time that a color-blind survey has been conducted among the Indian population. Color blindness is usually birth defects, but also secondary to various eye diseases. Francois and Verriest think that the abnormal color discrimination in humans is caused by accidental mutation rather than genetic inheritance by distant ancestors. According to some European scholars a few years ago, about 7-8% of the population had color blindness. Europe and the United States outside