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lecture 15 notes - Lecture 15 The Eye and Retina lens and...

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Lecture 15, October 25, 2007 The Eye and Retina lens and cornea: their role in accomodation zonula fiber stretch an elastic lens, zonula fiber attachments can be changed by contracting ciliary muscle, accommodation Defects in accommodation: myopia, hyperopia, presbyopia the iris and its control of the amount of light entering the eye, a role in adaptation to different light intensities. iris controls the pupil size meridonal fibers innervated by the sympathetic ns cause the pupil to dilate circular muscle fibers innervated by the parasympathetic ns cause the pupil to constrict bella donna retina, layers of cells: photoreceptors, horizontal cells, bipolar cells, amacrine cells, ganglion cells; the latter have axons that course across the surface of the retina to the optic disc, form the optic nerve, optic chiasm visual pathways major projection to thalamus, from thalamus onto occipital or visual cortex. consequence of exit from eye: blindspot movements of the eye: fixation movements saccades vergence movements
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