3 sentences

1. 老年人容易患白内障。

   lǎo​nián​rén róng​yì huàn bái​nèi​zhàng.

   Elderly people are prone to cataracts.

   Source: Dong Chinese Dictionary

2. 晶状体混浊会导致白内障。

   jīng​zhuàng​tǐ hùn​zhuó huì dǎo​zhì bái​nèi​zhàng.

   Clouding of the lens leads to cataracts.

   Source: Dong Chinese Dictionary

3. 白内障是导致老年人失明的主要原因之一。

   bái​nèi​zhàng shì dǎo​zhì lǎo​nián​rén shī​míng de zhǔ​yào yuán​yīn zhī yī.

   Cataracts are one of the leading causes of blindness in the elderly.

   Source: Dong Chinese Dictionary