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1. One example of an eye disfunction is Presbyopia. This is when the eye does not focus properly, and becomes obvious when you continue losing focus when you are reading. Some who have it complained that their arms were to short, and they were not able to focus properly. Presbyopia is not routinely curable, it is mostly prevented by wearing glasses or contact lenses.
2. Another example of an eye disfunction is Amblyopia, also known as lazy eye. The problem is caused by either no transmission or poor transmission of the visual image to the brain for a long period of time. Which can lead to blindness in that eye. The most common method of treatment is putting a patch over the "healthy" eye so that the brains connection with the lazy eye is strengthened.
3. A final example of an eye disfunction is a Cataract. A cataract is a clouding of the eye's natural lens, which lies behind the iris and the pupil. The lens is mostly made of water and protein. The protein is arranged in a precise way that keeps the lens clear and lets light pass through it. But as we age, some of the protein may clump together and start to cloud a small area of the lens. This is a cataract, and over time, it may grow larger and cloud more of the lens, making it harder to see. The most effective cure is to have surgery, in this procedure they replace the clouded lense with a plastic clear one.