Stupid question, I know. I just started wondering, though, and want to know what others think.
@Jorgevy: What I meant about aiming, is that it wouldn't be that hard. People have trouble aiming a gun because they can't see exactly what it's pointing at. Whereas he aims simply by looking at something. That's all I meant.
I figured he could see, because he's not exactly shooting lasers. He's heating everything in his scope of vision. He was also able to see in Final Crisis when he was using minor heat vision on Lois's heart to keep it beating.