Iris melanomas are much less likely to metastasize than other uveal melanomas, and less likely to impair vision if detected and treated early.

Scuba divers often spit into their masks and then wash the surface quickly with water to prevent mist buildup that can impair vision.

Prolonged exposure may cause serious damage to the central nervous system, impair vision, cause liver or kidney damage, anemia and lung irritation.

Glaucoma, retinal degeneration, and clouded corneas may significantly impair vision.

If large, it will impair vision.