The analysis of the CYP1A1 polymorphisms in pterygium showed that 68 (33.2%) were homozygous for the m1/m1 genotype, 29 (14.1%) were homozygous for the m2/m2 genotype, and 108 (52.7%) were heterozygous for the m1/m2 genotype. This evidence concerns the gene CYP1A1 and pterygium.