Yes, and... "However, the neural circuitry in your eye only passes a signal along to the brain if several photons are detected at about the same time in neighboring rod cells. Therefore, even though your eye is capable of detecting a single, isolated photon, your brain is not capable of perceiving it. "

Also, evolutionarily, it appears as if eyes were evolved 3 separate times. And: "Eyes and other sensory organs probably evolved before the brain" https://en.wikipedia.org/wiki/Evolution_of_the_eye (which is outstanding on this topic)