If your eye is not exactly the right shape, or your lens cannot focus properly, you cannot form a clear image on you retina. If this is the case, you may need to wear glasses to correct your vision. For a short-sighted person, distant objects look blurred because the image forms in front of the retina. But a short-sighted person can see objects that are close very clearly. For a far-sighted person, the image tries to form behind the retina, so it is blurred while the lens tries to focus on a nearby object. Another sight problem is called astigmatism. This is when the cornea is not evenly curved and distorts the vision. The different sight problems can be overcome by wearing glasses. Encyclopedia of Questions & Answers, Bounty Books

If your eye is not exactly the right shape, or your lens cannot focus properly, you cannot form a clear image on you retina. If this is the case, you may need to wear glasses to correct your vision. For a short-sighted person, distant objects look blurred because the image forms in front of the retina. But a short-sighted person can see objects that are close very clearly. For a far-sighted person, the image tries to form behind the retina, so it is blurred while the lens tries to focus on a nearby object. Another sight problem is called astigmatism. This is when the cornea is not evenly curved and distorts the vision. The different sight problems can be overcome by wearing glasses. Encyclopedia of Questions & Answers, Bounty Books