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Understanding the Eye

As you familiarize yourself with our procedures and treatments, you may encounter unfamiliar terms. We hope you find the information on this page helpful.

A condition caused by imperfections in the cornea, resulting in light being focused at two different points. Astigmatism can exist on its own or in conjunction with myopia or hyperopia.

An opacity or cloudiness of the lens of the eye that interferes with vision by blocking light.

The clear circular window at the front of the eye. It refracts light that enters the eye onto the lens, which it then focuses on the retina.

A disease of the optic nerve and the leading cause of preventable blindness. Glaucoma is frequently associated with elevated eye pressure.

Also known as farsightedness. Hyperopia occurs when light is focused too far back in the eye, making it difficult to see nearby objects.

The colored part of the eye. The iris controls the amount of light that passes through the pupil.

The transparent, double-convex portion of the eye that further focuses light from the cornea onto the retina.

A procedure that corrects one eye for distance vision, while correcting the other eye for near vision. It is typically used to treat patients suffering from presbyopia.

Also known as nearsightedness. Myopia occurs when light is focused too far forward in the eye, making it difficult to see faraway objects.

Frequently the cause for reading glasses. Presbyopia can exist by itself or along with myopia, hyperopia, and/or astigmatism. It occurs primarily between 40 and 45 years of age. Presbyopia occurs when the lens system lacks sufficient elasticity and/or space to maintain focus when objects are within arm’s length.

The back wall of the eye. The retina is covered with specialized nerve cells that convert images to electric energy.

Resources – Guides to Vision Health