Better than anything else I have found
I've spent a lot of money lately on sights, mini red dots and lasers to compensate for my aging eyes. In bright sunlight outside there are other iron sights that also work good but when indoors I can't see at all. Even with these, if target is red it becomes more difficult but without corrective lenses I could shoot a reasonable if not great group indoors at 15 yards, and 10 ft was easy. With any other iron sights indoors without corrective lenses 15 yards is so bad I would risk missing target. With none of the downsides of lasers or mini red dots. I wish they were available for every gun I own.