Theres a recent thread on my local "action shooters" forum where people note that the use of prescription glasses is causing weird effects with red dot sights. The dot is a galaxy or supernova, or whatever. I understood that the use of reading glasses is the worst. People didnt specify if they were using the dots on pistols or "long guns".
Sako Brown bear in 450 Rigby
just added a Aimpoint hunter dot sight
can't wait fir the snow to melt to try it out