Radiation from the sun also causes often serious sunburn , skin aging , eye cataracts , pterygium - a fleshy growth on the surface of the eye , cold sores and other ills , according to the report , the first to detail the global effects of sun exposure . ultraviolet light is needed to activate production of vitamin d in the body , which prevents rickets , osteomalacia and osteoporosis 世界卫生组织发表报告称，太阳光照射过度不仅会增加人们患癌的危险，同时也会造成严重晒伤皮肤老化白内障翼状胬肉从眼睛内角的结膜生出一块不正常的块状组织以及唇疱疹等其他一些不良后果。
