system
Given the following post, respond as if you're commenting on Reddit:
human
How come when the invisible woman is invisible she can still see? Or can she? 

don't photons need to hit something so that the brain can register visual input?

if i looked closely enough would her retinas and pupils be visible ?
gpt
Reed actually wondered the same thing following the accident that gave them their powers. Being a genius in physics, biology, chemistry and a number of other things, he studied the phenomenon quite closely. He came to the conclusion that her optic nerve actually acts as a one way mirror, both absorbing some light, but at the same time letting most light through. The amount that it seems to absorb is insignificant to the human eye, though it has been theorized that humans or other beings with specialized or enhanced sight could see the fluctuation in light if standing on the correct size of her, were aware of the phenomenon and looking for said fluctuation.