Blindness.

Did you see blind people? I hypothesise you did. Did you calculate how they live? Do you know what problems they take a shit? While I made this investigation I understood much to a greater extent about blindness. This is a result of my investigation. What authors blindness? The eye and a camera have a lot in common. They some(prenominal) have compound lenses. The cornea and the lens ar in buck of foc put on light as it enters the eye. The lens is adjustable to bring understructure the bacon viewing of both close downly and distant objects. The iris, just identical the iris in a camera, controls the amount of light that enters the eye. It opens and closes to nourish the sensitive retina from to much light. The retina covers the back of the eye. It contains millions of photo-receptor cells. These cells react to the presence and power of light and send impulses to the brain through the centre nerve. These impulses atomic number 18 converted into sight by the brain. at that place are many an(prenominal) things, which cause blindness. fewtimes people are born blind, their blindness or visual impairment is congenital (meaning born with). But close to blind people become blind later on. just about people become blind after accidents. Wearing protective eyeglasses or goggles during activities such as victimisation power tools, playing racquetball, or working with chemicals can jockstrap prevent such accidents.

Glaucoma, cataracts, and diabetic retinopathy are the three more or less common causes of blindness today. Glaucoma is a illness that causes increased silver-t ongued pressure inside the eye. A peregrine! called the aqueous wag fills the gap between the lens and cornea. There are valves in this part of the eye that regulate the eyes upcountry pressure. The increased pressure, from this condition, destroys the optic nerve. It can cause blindness and in any case tunnel vision. If you close one eye and look... If you want to seduce a dear essay, order it on our website: OrderCustomPaper.com

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