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Did you see blind people I think you did Did you think how they live Do you know what problems they have While I made this investigation I understood much more about blindness This is a result of my investigation What causes blindness The eye and a camera have a lot in common They both have compound lenses The cornea and the lens are in charge of focusing light as it enters the eye The lens is adjustable to allow viewing of both close and distant objects The iris just like the iris in a camera controls the amount of light that enters the eye It opens and closes to protect 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 intensity of light and send impulses to the brain through the optic nerve These impulses are converted into sight by the brain There are many things which cause blindness Sometimes people are born blind their blindness or visual impairment is congenital meaning born with But most blind people become blind later on Some people become blind after accidents Wearing protective eyeglasses or goggles during activities such as using power tools playing racquetball or working with chemicals can help prevent such accidents Glaucoma cataracts and diabetic retinopathy are the three most common causes of blindness today Glaucoma is a disease that causes increased fluid pressure inside the eye A fluid called the aqueous humor fills the gap between the lens and cornea There are valves in this part of the eye that regulate the eyes internal pressure The increased pressure from this condition destroys the optic nerve It can cause blindness and also tunnel vision If you close one eye and look through a paper towel tube with the other eye you will see what tunnel vision looks like If detected early glaucoma often
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