Glossary

• allergic conjunctivitis: the eye's reaction to allergy-causing substances like pollen and dander. Allergic conjunctivitis may include redness, tearing, and itching.²
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• aqueous humor: a transparent fluid occupying the space between the crystalline lens and the cornea of the eye.³
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• chronic: marked by long duration, by frequent recurrence over a long time, and often by slowly progressing seriousness; not acute.³
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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.³
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• drainage: the act or process of drawing off fluids from a cavity or wound by means of suction or gravity.³
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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 disk and gradual loss of vision.³
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• intraocular pressure (IOP): the pressure within the eyeball that gives it a round firm shape and is caused by the aqueous humor and vitreous body.³
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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.⁴
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• nearsighted: able to see near things more clearly than distant ones.³
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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.⁵
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• open-angle glaucoma: a progressive disease in which the drainage channel for the aqueous humor composed of the attachment at the edge of the iris and the junction of the sclera and cornea remains open and in which serious reduction in vision occurs only in the advanced stages of the disease due to tissue changes along the drainage channel.³
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• optic nerve: a bundle of more than 1 million nerve fibers that connects the retina to the brain.⁷
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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.⁷
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• visual acuity: how well you see at various distances.⁶
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• visual field: the entire expanse of space visible at a given instant without moving the eyes.³
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