The lens of your eye should focus light on the retina. When this doesn’t occur correctly, your vision is blurry. If you are farsighted you can see things faraway but have difficulty seeing close-up objects. If you can see things close-up but have trouble seeing faraway objects, you are nearsighted. Contact lenses or glasses correct these two conditions. Blind people use braille to read. These patterns formed by raised dots are read by touch. Specially trained guide dogs assist blind people.