BCS 151 Chapter Notes - Chapter 2: Optic Disc, Visual Acuity, Emmetropia
19 Sep 2016
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Pages 31 38: what is light, a form of electromagnetic radiation, energy produced by vibrations of electrically charged material, conceptual forms 1) wave or 2) a stream of photons. Wave an oscillation that travels through a medium. Emmetropia the image is focused on the retina. Myopia the image is focused in front of the retina; nearsightedness: corrected by a convex lens. Hyperopia the image is focused behind the retina; farsightedness: corrected by a concave lens. Relax lens is relatively flat to see distant objects. Contract lens is relatively thick to see near objects. Pages 38 49: five major classes of neurons, photoreceptor a light-sensitive receptor in the retina. Cones daylight vision, fine visual acuity and color: most concentrated in the center of the fovea. Intensity decreases with the further away you get from the retina (retinal eccentricity) Rods night vision: absent from the center of the fovea. Intensity increases at a peak at about 20 degrees and then declines again.
