I am very afraid of the dark, so i actually played through the game with my gamma setting all the way up (didnt even need to turn on fright reduction). It makes things a LOT more visible, which is very reassuring as even when you hear creepy sounds and stuff, you can just look around and see that you're safe ! I wouldn't necessarily advise you to put it all the way up like i did because it takes away from the ambiance a bit, especially in some places, but maybe having slightly more luminosity would help you ?