Po-Tzu is a small town over the south Taiwan, the cataractous patient combined with pterygium, trachoma cicatricial, trichiasis and macular cornea is more common than that in urban areas.

• 摘要朴子镇位于嘉义县西部近海，病患以农、渔业者居多。因民风保守，白内障患者常并有砂眼、睫毛倒长、角膜白斑、翼状赘片等病变。