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Vision_review - Layer 1 Layer 2 Layer 3 Lens Sclera Iris...

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Retina Optic Nerve 1 million fibers Sclera Cornea Choroid Sclera Pupil Iris Iris muscles Circumferential muscles (parasympathetic) - makes pupil smaller Radial Muscles (sympathetic) - makes pupil larger Posterior chamber Vitreous Fovea Centralis Anterior Chamber Lens Layer 1 Layer 2 Layer 3
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Myopia Long eyeball ‘Nearsighted’ (Use concave lens to fix) Hypermetropia Short eyeball ‘Farsighted’ (Use convex lens to fix) Emmetropia: normal vision
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Light Bipolar Cell 3 layers of Retina (300uM): Photoreceptor Bipolar Ganglion
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Rods ~100 million Low light Most peripheral to fovea centralis Pigment - rhodopsin Cones ~6 million Color & High light Most in fovea centralis Pigment - iodopsin
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