Cataract is a very common eye disease, especially among middle - aged and elderly people. According to different causes, it can be divided into the following types.

- Congenital cataract.
- Age - related cataract.
- Complicated cataract.
- Metabolic cataract.
- Drug - and toxin - induced cataract.
- Traumatic cataract.
- Posterior cataract.
