In humans and other developed species it can cause eye cataracts and skin cancer.

BBC: By Environment Correspondent Alex Kirby

The Caribbean Mercy is smaller and has two operating theatres which deal mainly with eye surgery (mostly cataracts).

BBC: NEWS | Health | ''Floating hospitals' mercy missions'

And they did not suffer cataracts of the eye.

ECONOMIST: A way to counteract part of the process of growing old

Having lost one eye as a child, he suffers inoperable cataracts on the other.

ECONOMIST: Letters

The queue for eye surgery has risen by 140% in the past ten years, mainly because there are more elderly people needing cataracts removed.

ECONOMIST: Waiting for Dobbo