PSY100Y5 Chapter Notes - Chapter 4: Optic Chiasm, Color Vision, Neural Pathway
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PSY100Y5 Full Course Notes
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4-2 our sense of sight: the visual system. Light enters the eye through the cornea and pupil and is focused upside down on the retina by the lens. Distant objects appear blurry to nearsighted people and close objects appear blurry to farsighted people. The retina is the neural tissue in the eye that absorbs light, processes images, and sends visual signals to the brain. Cones, which are concentrated in the fovea, play a key role in daylight vision and colour perception. Rods, which have their greatest density just outside the fovea, are critical to night vision and peripheral vision. Dark adaptation and light adaptation both involve changes in the retina"s sensitivity to light, allowing the eye to adapt to changes in illumination. They vary in shape and size, but centre-surround arrangements are common. The optic nerves from the inside half of each eye cross at the optic chiasm and then project to the opposite half of the brain.
