i have to wear contacts with my I4's
As a martial i see a lot of people come with glasses, we have tried all sort of anti-fog solutions and have yet to find any that really work, especially when the weather is very humid
If a person sweats a lot and release lots of moisture from their face or when the face is considerably warmer than the outside air it evaporates into the space between your mask and then condensates on your lens. can use Anti-Fog Spray, Mask Fan, Thermal Lenses to avoid this problem.
i just chuck some fairy liquid or similar on them in the morning before i leave, wipe it off after a bit and it does the job most of the day. works better than this vforce spray ive got kicking about.
I have a flesx 8 with thermal lenswhich fits my glasses just right. As for fogging i use 2 fans attached to the top they started out as a Fanz kit that the cables broke in the first 20mins so took home chopped and solidered reattached problem all sorted no fogging.
There is a guy that plays at CPPS events that has his glasses tapped onto the OUTSIDE of his gogs and plays pretty well with them like that, I may be wrong but I think he plays for Team Snatch
i prefer to wear contacts when paintballing, as it opens up the different styles of mask you can wear.
I am not sure if they still do it but there used to be an insert that you could put a set of prescription lens into the frame then clip it inside your goggles.
Not sure if this is still being made though.