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.
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