What is the cause of cataracts?

Why do people get cataracts?

Maybe it's just caused by aging all along...

I thought it was natural that everything happens as you age.

Ever since my mom was diagnosed with cataracts, I've become interested in various related things.

Why does cataract develop?

I think we can prevent it if we know the cause.

I'm also curious if using a cellphone or computer has any effect.ㅠ