Glossary

• allergic conjunctivitis: the eye's reaction to allergy-causing substances like pollen and dander. Allergic conjunctivitis may include redness, tearing, and itching.³
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• aqueous humor: a transparent fluid occupying the front and rear chambers of the eye, nourishing the lens and cornea.⁴
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• chronic: a condition that persists for a long time and generally cannot be prevented by vaccines or cured by medication.⁴
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• contraindication: a special symptom or circumstance that renders the use of a remedy or the carrying out of a procedure inadvisable, usually because of risk.⁴
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• drainage channel: also known as the drainage angle, where fluid flows from the eye; if these channels are blocked, high eye pressure can result.⁴
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• glaucoma: a disease of the eye marked by increased pressure within the eyeball that can result in damage to the optic nerve and gradual loss of vision.⁴
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• intraocular pressure (IOP): the pressure within the eyeball that gives it a round firm shape and is created by the continual renewal of fluids within the eye.⁴
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• laser surgery (for glaucoma): laser surgery that involves either laser treatment or making a cut in the eye to reduce the intraocular pressure (IOP). The type of surgery your doctor recommends will depend on the type and severity of your glaucoma and the general health of your eye. Surgery can help lower pressure when medication is not sufficient; however, it cannot reverse vision loss.⁵
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• nearsighted: able to see near things more clearly than distant ones.⁴
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• ocular hypertension: an increase in the pressure in your eyes that is above the range considered normal, with no detectable changes in vision or damage to the structure of your eyes. The term is used to distinguish people with elevated pressure from those with glaucoma, an eye disease that causes damage to the optic nerve and vision loss.⁶
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• open-angle glaucoma: occurs when the aqueous (fluid) in the eye cannot get through a filtration system called the trabecular meshwork into the drainage canals, causing pressure to build up within the eye, which can damage the optic nerve and impair vision; open-angle glaucoma is the most common form of glaucoma.⁴
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• optic nerve: a bundle of more than 1 million nerve fibers that connects the retina to the brain.²
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• surgery (for glaucoma): surgery makes a new opening for the fluid to leave the eye. Your doctor may suggest this treatment at any time. Surgery often is done after medicines and laser surgery have failed to control pressure.²
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• visual acuity: how well you see at various distances.²
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• visual field: the entire area that can be seen at a given instant without moving the eyes.⁴
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