how does the eye work,and what types of things can go wrong with it?

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In todays society, vision is usually considered to be our most important sense.many people certaintly live happy and productive lives without it, but those of us who are blessed with good eyesight probably would not trade it for all the money in the world.we use it for practically every activity other than sleep. we rely on it so heavily,in fact,that we generally ecpect it to serve us well until the day we die.despites its importance,however,things dogowrong.vision dims and blurs for no apparent reson.closeup or faraway objects may be hard to see clearly.the agingprocess and our increasing lifespan can take itstoll.disease like disbetes and hypertension will affects our eyes.accidents and illnesses may destroyour vision.