I'm thinking of trying a laser because of my eyes. When I was younger, I was a fairly capable shot. Not like I could win any competitions or anything, but capable. As I get older, my near vision is getting worse. With nothing but clear glasses, I can't see the sights very well and when I focus down range on the target, the sights are quite blurry. If I put my reading glasses on, the sights were in focus but the target is blurry. At the range, for shooting glasses, I use my work Safety glasses which are Bi-Focals, clear on top and reading on the bottom. It took some getting used to, but I can do okay with them.
But we all know that in an emergency situation, I most likely will not have the time to get out my Bi-Focals and put them on.
The gun I was using had non removable fixed sights and they were black. I painted them yellow, and that helped a little. But, not enough. So I got the M&P Shield based on reviews and reports of it's reliability, it is similar in size to my old gun, but partly because if the 3 dot sights. They are a little easier to see even if they are blurry. And they are replaceable. I am looking at the various night sights trying to decide what I want.
But my thinking is this: In addition to the sights, If I could keep my focus downrange on both the target and the laser, of course keeping the sights in mind, maybe that would help?