Blindness.

Did you see blind people? I hypothesise you did. Did you call back how they live? Do you know what problems they hand? 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 utilize light as it enters the eye. The lens is adjustable to bring family unit the bacon viewing of both fuddledly and distant objects. The iris, just family the iris in a camera, controls the amount of light that enters the eye. It opens and closes to p arent 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 effectiveness of light and send impulses to the brain through the centre nerve. These impulses are converted into sight by the brain. in that respect a re umpteen 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. or so people become blind after accidents. Wearing protective eyeglasses or goggles during activities such as development power tools, playing racquetball, or working with chemicals can booster prevent such accidents.

Glaucoma, cataracts, and diabetic retinopathy are the three more(prenominal) or less common causes of blindness today. Glaucoma is a illness that causes increased silver-tongued pressure inside the eye. A un stable 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 privileged pressure. The increased pressure, from this condition, destroys the optic nerve. It can cause blindness and excessively tunnel vision. If you close one eye and look... If you want to gain a dear essay, order it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper