Are you looking for a pair of glasses to use just for the range when shooting iron sights?
I have a pair from Liberty Sport, the Boreal glasses, that uses magnetic interchangeable lenses.
When I shoot iron sights I use a computer monitor distance lens for my dominant eye and a distance lens for the other eye. It takes a few minutes for the old brain to adapt, but it works pretty well for me.
I had my optometrist set up the prescription for reading a computer monitor at arms length for the dominant eye and I've been using that system for well over 6 years. It works well enough for me to shoot the local Bullseye match and usually place in the top 4 using a 50 year old Clark Custom 6" longslide in .45 ACP.