Researchers have discovered that power-producing organelles in the eye's photoreceptor ... the trip is hardly direct. Once light reaches the retina, it must pass through multiple neural layers ...

Researchers at the National Eye Institute ... pressure for light to be translated into signals and pass instantly from the retina to the brain, the trip is hardly direct. Once light reaches the retina ...

It controls and directs light rays into the eye and helps achieve clear vision. It's normally transparent. But injury or infection results in scarring of the cornea.