Sometimes eyes need help to see well. When you go to your optician for a checkup, he or she checks your eyes. You read a chart from across the room. If you cannot read the chart very well, your eyes might need help.
Eyeballs should be nearly round. People whose eyeballs are too long are shortsighted. Close up, they can you see things well. But if they look at an object that is far away, such as a far-off house, they see a blur. That’s because a clear picture of the house does not form at the back of their eyes. Short sighted people wear glasses or contact lenses to help them see things that are far away.
People whose eyeballs are too short or long sighted. They can see things in the distance well. But when they look at something nearby, such as the words in a book, they see a blur. A clear picture of the words does not form at the back of their eyes. Long sighted people wear glasses or contact lenses to help them see things that are nearby.
Some people wear contact lenses instead of glasses. Contact lenses are made of clear plastic. They float over the irises on the tears that cover the eyes.
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