Redeye

noun

1. The names of animals that have red eyes.
2. Types of beverages.
3. (travel) An overnight airplane flight.

   "I waited too late to book my holiday flight, so I had to take the red-eye."

4. Redness of the conjunctiva; especially when caused by conjunctivitis (pink-eye).
5. Redness in the eye(s) of someone in a colour photograph, as an unwanted consequence of light from a flash reflecting off blood vessels in the retina.