Cataracts frequently afflict the middle-aged and elderly. Every year in Taiwan about 110,000 people undergo cataract surgery. About 80 % of these select cataract surgery and intraocular lenses, which are covered by NHI. The remaining 30,000 select more expensive multifunctional intraocular lenses.
白內障則是中老年人常見的眼疾，台灣每年約有 11 萬人接受白內障手術，受術民眾中約 80 % 選擇健保給付的白內障手術和人工水晶體植入術，其餘近 3 萬人則選擇植入價格較昂貴的多功能人工水晶體。