Corrected entry: Anything that is not a living part of the Invisible Man is visible; for example, the food he eats is visible until it is digested. However, for some reason his hair, beard and the tips of his fingernails, though nothing more than dead cells, are invisible. Several scholars have noted this as a mistake.
Factual error: Any invisible man would be blind. This is because if your retina in the eye is as transparent as an invisible man's, any image that can form on it will pass right thorough it without generating any vision signal via optic nerve. Thus your brain gets no visual signal if you are invisible.
Correction: It's still part of his body. The food he eats isn't invisible until it becomes part of him. And then it is still part of his body, even if dead, as his hair and nails.
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