I don't have cataracts, so I can't speak to medical miracles, but what I notice is that if I play videogames for a long period over weeks (or any long-term PC/TV use), what happens is my eyeballs get stiff from very little movement. You feel like you're "looking around" a lot when playing a game, but unless your monitor is 100 feet wide, most of the time your eyeballs aren't moving too much in their sockets. So, at least for me, they get fatigued from lack of eye muscle exercise, or something. I dunno.
But I don't think my vision has become any worse or better since computers/games became a common household item in our house. I've been near-sighted since I was 12y.o, and my prescription hasn't changed for 20 years. Just occasional eye fatigue that's cured by going outside and looking at real 3D vistas/objects & lighting for a while.
