Some scientists have theorized that plants can see.
Humans aren't the only animals who become farsighted as they age.
Fogbows are created in much the same way as normal rainbows are. The main difference is the size of the water droplets which affect the light's refraction.
Green sunfish can see quite well in water that is thick and murky. How?
Why are owls such efficient predators? Large eyes and flexible necks.
We don't perceive color in our peripheral vision because we have no cones, which sense light frequencies, on the outer edge of our retina.
Eye movements can cause you to mistakenly perceive isolated objects as moving.
From the man in the moon to the Virgin Mary's face on a cinnamon roll, humans have a tendency to see things that aren't there.
Mona Lisa's smile appears and disappears as we alternate between peripheral and central vision.
Dung beetles use moonlight's polarization to guide its dung hunts.