BIOC32H3 Lecture Notes - Lecture 17: Ciliary Muscle, Zonule Of Zinn, Visual Acuity

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7 Jan 2018
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Internal anatomy of the eye: round chamber filled with liquid lens, vitrious chamber majority of the eye. Lens and cornea focuses light onto retina (back of eye) where photoreceptors are located. Lens controlled by the cilary muslces and zonule ligaments. Light enters eye through cornea then focused by the lens onto the retina: pupil can range in diameter from 1. 5 mm to 8 mm (28 fold difference, allows for control in focusing light. Light energy (physical) is changed into an electrical signal propagated to the visual cortex. Accommodation: process by which eyes adjust lens shape to focus an image on the retina: some people born with problems with vision, accommodation process by which eyes adjust lens shape to focus an image on the retina. Phototransduction occurs at the retina: photoreceptors located at retina at back of eye, dark epithelium helps to increase visual acuity prevent light from bleaching the photoreceptors. Contains only cones that are specific to color.

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