When you open your eyes you only see light. The image you see is light and nothing else. If you had strong enough telescope (we'll ignore how big it would have to be just for the sake of the argument) and looked at the earth from 100 light years away you would absolutely see into the past. You would see people in 1920s walking around in their old timey outfits talking about 1920s stuff in their 1920s cars.