Quoted from Whysnow:
Seriously you may want to get in to the doc and have things checked out. It sounds like your eyes are not properly adjusting to the darkness of the game room with only 1 game on.
Cone cells take around ten minutes to adjust to darkness. Go in your game room, chill and appreciate the glory of the machine and then fire it up. If you still think the game is too dark then honestly, get into the doc! Many eye issues if caught can be dealt with. As we age, the eye will start to have issues so regular check ups are important.
I'll get them checked. Better spread this public service announcement around pinside though as it seems all of are going blind but you and RD.
Whysnow, saving eyesight one pinsider at a time.