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Health Studies
Ingrid L.Stefanovic

Vision: Light passes through the cornea, a transparent structure that protects the eye. By contracting and dilating, muscles in the iris regulate the amount of light that enters the eye. At the back of the eye is the retina, which contains photoreceptors (rods and cones). - The lens focuses the image on the retina, adjusting for the distance of the object. - The photoreceptors then translate light energy into action potentials in the optic nerve. Cones are responsible for color vision, whereas rods only transmit information in black and white although they are more sensitive to light. Cones are most numerous in the macula, which is in the center of gaze in a direct line from the cornea; rods are typically found in the more peripheral regions of the retina. The whole structure is supported by gel-like substances called humors in the chambers in the eye. - Aqueous (watery) humor not only provides support but also transports nutrients and wastes, whereas the more gel-like vitreous humor protects the eye against shock. The conjunctiva, a clear mucus membrane inside the eyelids, also provides protection. The complexity and sensitivity of the eye make it quite vulnerable to aging effects. - The cornea, lens and vitreous humor all diminish in transparency, reducing the amount of light entering the eye and also scattering the light that does come in, making the eye m
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