The pupil of the eye in a photograph of a face can be mined for hidden information, such as reflected faces of the photographer and bystanders, according to research led by Dr. Rob Jenkins, of the Department of Psychology at the University of York and published in PLOS ONE (open access).
This is also true with cat photos, here’s mosfet and you can see his human friend in his eye.
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Since the is two images, you may be able to extract some 3D information as well.
If you merge the two PT reflections in mosfet’s eyes by looking past the screen you can see PT in 3D.