* Larger pupils: Cats have pupils that can dilate much wider than human pupils, allowing them to let in more light. This is especially helpful in dim lighting.
* Tapetum lucidum: Cats have a special reflective layer behind their retinas called the tapetum lucidum. This layer reflects light back through the retina, amplifying the amount of light that is detected. This is what gives cats their "eye shine" in the dark.
* More rods: Cats have a higher concentration of rods in their retinas compared to humans. Rods are photoreceptor cells that are sensitive to low light.
However, while cats can see in very dim light, they are still not seeing in complete darkness. They see things in shades of gray and have a more limited field of vision in low light.
Here's an analogy: Think of it like a camera with a high ISO setting. It allows you to take pictures in low light, but the images are grainy and less clear.
In conclusion: Cats can see much better in low light than humans, but they don't see in complete darkness. Their ability to see in dim light is enhanced by several adaptations, including larger pupils, a tapetum lucidum, and more rods in their retinas.