PSY 351LEC Lecture Notes - Lecture 11: Scotopic Vision, Optic Nerve, Color Blindness
22 May 2019
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When we talk about what we see we mean the limit range of electromagnetic energy. Function of eye pick up, not what out there (limit range of photoreceptor) Property of light: diff wavelength can change color, amplitude indicate bright or dark. The photon is the basic unit of light. Retina:sensitive to light and that trigger nerve impulses that pass via the optic nerve to the brain, where a visual image is formed. ( lines the back of the eye on the inside. Optic nerve: second cranial nerve or cranial, transfer visual information from the retina to the vision centers of the brain via electrical impulses. Rod and cone: both respond to bright and dark,photoreceptors in the human retina. Rods active in dim light (scotopic vision). (sensitive to light) low spatial acuity (periphery) easily saturated. Cone: acuity,wavelength, color, not active in dim light , more around fovea. Color blind: no light selective in rods.
