(Both are named after their relative shapes.) Cones work in bright ... Some animals accomplish this with a retractable eye flap. Others rely on their pupils. The circular pupil, because of the ...

While experts are still learning a lot about the reason for different pupil shapes, it's interesting to learn all the theories they've already come up with about the cat's unique looking eyes.

It is a crescent-shaped area of land in Western Asia ... in the center of the iris (the colored part of the eye). The role of the pupil is to let light in and onto the retina at the back of ...

That coloured circle is called the iris and the black spot in the middle is the pupil. This is the part of the eye that lets the ... The rods see the shapes of things, picking out black, white ...

It was previously believed that our pupil size was only affected by three things: light, focusing on nearby objects and cognitive effects.

pupil movement might one day be used to detect disorders such as insomnia and post-traumatic stress disorder, or even a comatose patient’s recovery. We haven’t yet figured out if eyes are ...