Blindness.

Did you see blind people? I hypothesise you did. Did you conceptualise how they live? Do you know what problems they contain? 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 employ light as it enters the eye. The lens is adjustable to bring radix the bacon viewing of both goally and distant objects. The iris, just akin(p) the iris in a camera, controls the amount of light that enters the eye. It opens and closes to encourage 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 force play of light and send impulses to the brain through the centre nerve. These impulses atomic number 18 converted into sight by the brain. there are many another(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. some(prenominal) people become blind after accidents. Wearing protective eyeglasses or goggles during activities such as using power tools, playing racquetball, or working with chemicals can garter prevent such accidents.

Glaucoma, cataracts, and diabetic retinopathy are the three more than or less common causes of blindness today. Glaucoma is a indisposition that causes increased silver-tongued pressure inside the eye. A liquid called th! e aqueous wag fills the gap between the lens and cornea. There are valves in this part of the eye that regulate the eyes infixed pressure. The increased pressure, from this condition, destroys the optic nerve. It can cause blindness and besides tunnel vision. If you close one eye and look... If you want to throw a dear essay, order it on our website: BestEssayCheap.com

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