01:830:301 Lecture Notes - Lecture 6: Scotopic Vision, Color Vision, Color Blindness
Document Summary
Choroid: eye gets blood supply from here. Retina: he retina is a light-sensitive membrane in the back of the eye that contains rods and cones, which receive an image from the lens and send it to the brain through the optic nerve. Cornea: transparent surface on the exterior of the eye. It protects the eye from the outside world. Being transparent, it allows light to be transmitted through it and into the eye: optical power: cornea (2/3) + lens (1/3, lens can change the optical power while cornea can"t. Lens are adjustable: ciliary muscles relaxed, the lens are relatively thin= weak optical power, ciliary muscles contracted, lens are thick= greater optical power (more bending is required to have more optical power for close objects) = aka. Condition in which light entering the eye is focused behind the retina. Eyeball too short or lens too weak. Nearby objects are blurred (rays don"t converge enough)
