I have bad astigmatism in both eyes, my retina's are really stretched and I've been warned about various activities (No playing squash, no bungee jumping, no watching a tennis match from the side, no roller coasters!) Obviously the last one being subjective to the G force and speed of the coaster, I don't know where the line is that's the issue!
I gave Big thunder a go, knowing it wasn't fast and no big drops/inversions, etc and all was good!
Just don't want to pass up the opportunity to enjoy these things with my kids before they leave the nest and do their own thing or have fun on a date night with hubby if I can do them without detaching my retina's!