Cats can reflect light from their eyes, giving them a glowing appearance. Species with glowing eyes have evolved to see better in low light because they hunt at dawn and dusk. As a result, domesticated cats can see in conditions that are only 16% as bright as what humans require to see. Cats are able to accomplish this because their pupils can become up to 50% larger than human pupils in dim light. They also have a high number of a specific type of light-sensing rods in the rear of their eyes that capture low-level light. Finally, cats also have something in their eye known as tapetum lucidum, or“eyeshine”. A cat’s tapetum lucidum is made up of cells with crystals that, like a mirror, reflect light back to the retina. This allows cats’ eyes to shine brightly in photos taken in a dimly lit room or glow when illuminated in the dark.