Put your Hands in front of your eyes before going in the dark room , your eyes will adjust much faster because it's darker than in the room.

Or maybe try a flashlight with redlight, eyes don't react to red light, so they don't need to adjust, but you can see everything.

Put your hands in front of your eyes before going in the dark room. Your eyes will adjust much faster because it is darker than in the room.

Or maybe try a flashlight with red light; eyes don't react to red light, so they don't need to adjust, but you can see everything.