Pterygium is sunlight related, ocular-surface lesion that obscures vision. The morbidity varies in different parts of the same country. Several surveys have shown that the countries nearer the equator have higher rate of pterygium than the other regions, the possible reason is due to the low latitude and stronger exposure to ultraviolet rays. The onset of pterygium is closely related to the environment, including ultraviolet rays, sandstorm, dry climate and so on. Prolonged ultraviolet-B radiation is regarded as a risk factor for pterygium, and that could explain its prevalence is much higher in the low latitude area.
YAN Qi-changWANG Xin-lingBAI Quan-haoWANG WeiGAO QianZHANG Jin-songLIU YangLIU Rong
目的研究紫外线辐射与翼状胬肉发病的量效关系。方法海南省三亚市崖城地区95例翼状胬肉患者作为翼状胬肉组,在当地人群中按相同年龄、性别、民族、是否戴眼镜和帽子的标准选取95名志愿者进行1∶1配对,作为正常对照。将两组人群按年龄分为青年、中年、老年3个阶段,通过详细询问研究对象个体累积户外活动的时间,填写调查表,以此计算个体紫外线暴露时间,作为紫外线暴露量,进行比较分析两组的紫外线暴露时间与翼状胬肉发病的关系。结果在青年组(35 637 h+13 587 h or 26 188 h+17 423 h;t=3.352,P=0.006,与中年组(73 412 h+23 082 h or 63368 h+25 091 h;t=2.322,P=0.024)患有翼状胬肉人群紫外线暴露时间明显高于对照组,而在老年翼状胬肉组(106 816 h+37 423 h or 106 748 h+43 111 h)与对照组的紫外线暴露时间未见有统计学意义(t=0.008,P=0.994);翼状胬肉的长度与紫外线暴露时间呈正相关(r=0.361,P<0.05),且随年龄增长而其长度也增加。结论紫外线辐射与翼状胬肉发病之间存在一定的量效关系。
