There are both internal and external changes to the eyes of a supernatural creature. Initially, the eyes will glow in response to emotion. Supernaturals will often identify themselves by flashing their eye color.
A supernatural creature with enhanced vision will more acute than a human's, and in more ways than one, including binocular vision or infrared. Said beings with a supernatural eyesight will possess glowing eyes that is reflective of their species.
Also, supernatural eyesight will reflect the light like eyeshine. Because of this, photographing, or filming such a person with an enhanced eyesight will be rather difficult, unless the being knows how to mask their vision.
Shapeshifters, or were-creatures such as canines, the werewolf, or the feline werejaguar will have night vision like most predators, being able to see well in low light as well as binocular vision. While provoked into a state of aggression, or in a state of bloodlust, a were-creature's vision will be internally depicted as red.