> UV is blocked by water (and our lens material) and can induce chemical changes (read: damage) easier than visible light. Damaging sensitive retina. Perhaps i

> UV is blocked by water (and our lens material) and can induce chemical changes (read: damage) easier than visible light. Damaging sensitive retina. Perhaps in an environment where UV provides the best illumination (due to the star being hotter, etc) creatures would evolve disposable eyes.