Glow

Glow is a term used to describe the golden light that is emitted from a vampire's eyes at all times. It is not fully understood why or how this glow occurs. The light can be hidden by wearing Optrix, a special form of contact lenses, so as not to alert humans to the presence of vampires. Optrix can fail to hide the glow when they get wet, such as with tears, as the light bends differently through the water allowing light to escape from the eye. The golden glow changes to a dark crimson when a vampire is overcome by the Thirst and for Nosferatu vampires they glow the same crimson color all the time.