As you say the answer is sketchy, all I know is that when my retinopathy was active I was told to refrain from anything too active and unfortunetly this included running, roller coaster rides were a No too and I was also told to avoid repeated lifting where it meant bending down, I asked if walking was OK as I walk a lot miles each week but was told this is fine.
What I would is check with your Ophthalmologist first and ask for their opinion, good luck!!!