In most cases they do not interfere with vision. (ashgi.org)
In fact, most dogs with cataracts do not need surgery, because most lens opacities in dogs (and a lens opacity is a cataract, no matter how tiny or big) are small and don't significantly interfere with vision. (animaleyecare.net)
Epic have proven that Fortnite's match dynamics is not something they take lightly, even resorting to pulling the Guided Missile for reasons of interfering with their vision of the game. (altchar.com)