PSY100H1 Chapter 3: Chapter 3
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PSY100H1 Full Course Notes
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What is visual acuity: the visual system codes images in terms of oriented stripes, narrowness of the stripes = visual acuity, contrast: the difference in illumination between a figure and its background (high contrast = better visual acuity, acuity: the smallest spatial detail that can be resolved (the most detail we can see, ophthalmologists use distance (20/20, 20/30, 20/15* particularly good vision, visual scientists use the smallest visual angle of a cycle of grating, resolution acuity is limited by the spacing of photoreceptor in the retina, the visual system samples the gratings discretely, limitation at photoreceptor reflects just one value of luminance, if there is some black and white stripes shinning on to one receptor you would get the one discrimination made my the receptor, acuity is further limited by convergence (e. g. multiple photoreceptors projecting onto a single bipolar cell)
