One of the problems that the invisible man has is that the light is always too bright. The eyelids cant shut out the light and the irises in the eyes can turn down, but they also do not block the light. So everything is too bright for the invisible man. Right? But if light can go through the eyelids and the irises, wouldnt it go through the photo receptors in the back of the eye also? Light has mass and the impact on the photo receptors is what causes them to pick it up. So if the light simply passes through them, there is no impact, and the receptors do not sense the presence of light, so, the Invisible Man is blind. I think another way to look at is is: Light has no idea the the Invisible Man is there. No interaction at all. So how does the Invisible Man sense the light enough to see? What do you think?