A cataract is clouding of the lens in the eye. The lens is the part of the eye that focuses light. Cataracts can cause vision loss.
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Glaucoma is a disease that damages the main nerve in the eye, called the optic nerve. It causes vision loss and can even lead to blindness. There are different types of glaucoma. The most common is called "chronic open-angle glaucoma."
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Presbyopia is a condition that impairs vision and that happens as a normal part of aging. It changes the ability of the lens in the eye to focus. People who have presbyopia have trouble focusing on things that are up close. They often have to hold things at arm's length to see them well.
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Diabetic retinopathy is an eye problem that can lead to vision loss and even blindness. It is most common in people with diabetes who do not control their blood sugar well.
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Dry eye happens when your eyes either do not make enough tears or the tears that they make evaporate (go away) too quickly. This causes your eyes to feel dry and irritated. The medical term for dry eye is "keratoconjunctivitis sicca."
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Crossed eyes is a condition in which the eyes don't line up with each other, and don't look in the same direction. The term doctors use for this is "strabismus." In some places, people use the word "squint" to describe crossed eyes.
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