PSYC 367 Chapter 2: May 15_The Structure of the eye&Basic Visual Neural Processing-Chapter 2.docx
Document Summary
The structure of the eye: a little light physics: Wavelengths in the visible spectrum: 380 nm 780 nm (nanometers) Refraction occurs when light passes from air into the eyeball: eyes that see light: Sclera : the tough outer membrane of the eye that holds the rest of the structures in; continuous with the cornea in front, and forms a sheath around the optic nerve in back; the. Four structures the cornea, aqueous humor, lens, and vitreous humor all refract light rays and help to focus images on the retina. The cornea is the most powerful refractor (does more of the focusing); the lens is the only one that can change its refractive power to bring objects at different distances into focus. All humans experience a gradual stiffening of their lenses with age. This decreases the ability to focus on near objects, a condition known as presbyopia. At about 40 50 years old, most adults will need glasses to read.
