The main cause of blindness and low vision is conqenital and heredlfary diseases ,occupying73.8%. The left are caused by other acquired diseases(26.2%).

• 致盲及低视力主要原因为先天性及遗传性眼病，占73.；8%25，常见是先天性白内障及先天性小眼球小角膜等10种眼病，其余为后天性眼病，占26