Light enters the eye through the cornea, which protects the eye and bends light to provide focus., The light then passes through the pupil, a small adjustable opening., The pupil’s size, and therefore the amount of light entering the eye, is regulated by the iris, a colored muscle surrounding the pupil., Behind the pupil is a lens that focuses the incoming rays into an image on the eye’s light-sensitive back surface., The lens does this by changing its curvature in a process called accommodation., The eyeball’s light-sensitive inner surface on which the rays focus is a multilayered tissue, the retina., Images appear upside down on the retina., The retina contains millions of receptor cells (rods and cones) that convert light energy into neural impulses., Rods and cones send messages to bipolar cells., Bipolar cells send messages to ganglion cells., The axons of ganglion cells converge to form the optic nerve., The optic nerve carries messages to the thalamus., The thalamus routes visual information to the occipital lobe where it is processed in the visual cortex..
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Vision: Sequence Review
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