Don't try to open your eyes, don't even focus on your eyes. Doing this will keep you grounded and anchored to your physical body. When you dream, are your eyes open? Nope. It's all images manufactured by your brain itself, not from the light entering your eyes. Your eyes should have nothing to do with your LDing, you shouldn't be trying to see with your physical vision, you should be seeing things in your head. It just seems like you're viewing with your eyes. I would recommend never trying to open your eyes. That's how most people wake up and get themselves out of nightmares and also out of SP. That's most likely what will happen to you, too.