What is the layer of cells of many nocturnal animals have behind the retina?

Many nocturnal animals have a layer of cells called the tapetum lucidum located behind the retina. This layer reflects light that passes through the retina back into the eye, enhancing the animal's ability to see in low-light conditions. The tapetum lucidum effectively increases the amount of light available for photoreceptor cells, improving night vision and giving their eyes a characteristic glow when illuminated.