This article is from the Ozone Depletion: UV Radiation and its Effects FAQ, by Robert Parson firstname.lastname@example.org with numerous contributions by others.
While the evidence for this is indirect, it is very plausible.
The lens of the eye is a good UV-filter, protecting the delicate
structures in the retina. Too much UV burns the lens, resulting in
short-term "snowblindness", but the cumulative effects of prolonged,
repeated exposure are not fully understood. People living in naturally
high UV environments such as Bolivia or Tibet do have a high incidence
of cataracts, and in general cataracts are more frequently seen at lower
latitudes. [Tevini] [Zigman] For more on this, see [De Gruijl 1995]