That would be a pretty big security hole in iOS if that was allowed, but it isn’t. Notification and other UI elements are rendered on top of the underlying app, which does not have access to or cannot see the full screen’s canvas. We can see practical implementations of this “snapshot” test feature in code:

https://github.com/uber/ios-snapshot-test-case

To counter the first theory, a contact cannot change the physical biology of the photon detecting cells (rods and cones) in the back of your eye. Nothing can, short of modifying your genetics.

So you can either become part mantis shrimp, or shift the wavelengths into the spectrum your biology already can absorb and interpret.