EYES AND VISION

THE HUMAN EYE Is a remarkable organ, and our visual capabilities are among the most sophisticated of any living creature. We can judge speed and distance well enough to catch…

EYE STRUCTURE

Each eyeball is roughly spherical, about 1 in (2.5 cm) in diameter, and lies in a protective bony socket in the skull. The eyeball has a tough outer coat called…

HOW THE EYE WORKS

When you look at an object, light rays reflected from the object hit the transparent cornea at the front of your eye. The rays are partly focused and pass through…

VISUAL PATHWAYS

Electrical signals from each retina pass along the optic nerves, which meet at a junction called the optic chiasm. Here, half of the nerve fibers from the left eye cross…