BIOSC-101 Lecture Notes - Lecture 19: Color Vision, Choroid, Cornea
14 Sep 2020
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Document Summary
Consists of blood vessels, lymphatics, and intrinsic eye muscles. Regulates the amount of light entering the eye. Secretes and reabsorbs jelly-like fluid (aqueous humor) Function: contains blood vessels that supply eye tissue with nutrients & oxygen contains melanin, which absorbs light reflected from the retina. Function: ring of muscle tissue that encircles the lens holds lens in place and changes its shape. Function: allows light to enter the eye & reach the retina. Dilates in dim light; constricts in bright light. Location: opening in the center of the iris. Location: muscular part of the choroid in front of the ciliary body. Function: provides fine focusing of the light (accommodation) Made of two layers: (pigmented layer outer layer) / (neural layer inner layer) Retina cells: rods (night vision) and cones (color vision) Function: contains photoreceptors that respond to light by generating electrical signals. Region of the retina with greatest concentration of cones. Function: objects are focused here for sharp vision.
