My near vision is not great. I've done a lot of experimentation over the last few years. Couple thoughts:
I like the Ameriglo CAPs much better than the Trijicon HDs. On both, the front is big and bright. But the Ameriglos are cheaper. Also, for me, it's harder to see the HD's U-shape rear notch. My eyes like sharp 90 degree angles on the rear notch.
If you're shooting Glocks, the basic factory steel front sight has a HUGE white dot. It's extremely visible, and inexpensive. (Conversely, the Glock factory night sights have a smaller dot that's harder to see).
Oddball option: If you're shooting Glocks, an Ameriglo CAP front sight will sit perfectly in a steel Glock rear. It's my preferred sight picture for competition and carry. POI can be tweaked easily by using different height rears until your elevation is where you like it.
If you have an P2000, I can send you a set of XS Big Dots. I tried em and didn't like them.
I believe DocGKR has described the efficacy of green lasers for shooters with vision issues.
Good luck, and please let us know how you get on.