BCS 110 Lecture Notes - Lecture 8: Retina, Saccade, Patent Lens
3 Oct 2017
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Document Summary
No light, no vision (even animals that can see in the "dark" need some light) Light can be thought of in two different ways: Waves (quicker waves - blue light, slower - red light) Visible light (for humans) is waves of electromagnetic energy between 380-760 nm. Light is changed by objects it encounters in its path: reflected, refracted (bent), diffracted, and absorbed. Images are flipped upside down in your brain but you see it as right side up. One-to-one correspondence between a point in space and a place on the retina. Iris: donut-shaped bands of contractile tissue that give the eye its color. Light enters the eye through the pupil - the hole in the iris. The pupil changes size in response to changes in illumination. Ciliary muscles later the shape of the lens as needed. Far vision: lens flat; near vision: lens convex. Convergence: eyes must turn slightly inward when viewing objects.
