Of course, not everyone has the same vision problems. Based on your prescription, you will need lenses that are tailored to your specific needs. When you are nearsighted or farsighted, the images you see are not focused in the correct place on your retina. Myopia causes images to focus in front of the retina. Whereas farsightedness causes images to focus behind the retina.

Other problems, such as astigmatism, can occur when the cornea is not uniformly shaped, which causes light rays to bend in different directions. Another common problem is presbyopia, the gradual loss of the eye's ability to focus on nearby objects. When you have an eye exam, you will learn exactly what type of glasses are appropriate for your prescription.