Rack's referring to a Pathfinder Oracle class feature 'Curse: Clouded Vision' that makes them completely blind at exactly 30 feet. You can do it, but with limitations/consequences. What you do is add tokens for your light sources on the token layer. Give all your players control of these tokens EXCEPT the oracle. On the light sources token advanced properties where you set the light distance, turn off the 'all players see light'. With that option off, only players who have permissions for the tokens can see its light. Next you make a light source token just for your oracle. Give it 30 ft light with no dim, give just the Oracle permission to control the token, and make sure 'all players see light' is off. As the GM, place the oracle's token icon on over the light source highlight both and group them so they move together as one unit. This has all sorts of annoying consequences (players can move lights around, oracle looks like they're always carrying a torch around, etc) but technically gets the job done. All said and done, I'd honestly just ask your Oracle to use the most overlooked and powerful tools available: imagination.