Normal-Tension Glaucoma Glossary of Terms

The following are health and medical definitions of terms that appear in the Normal-Tension Glaucoma article.

Alzheimer disease: See: Alzheimer's disease.

Anterior: The front, as opposed to the posterior. The anterior surface of the heart is tow...

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Anterior chamber: The space in the eye that is behind the cornea and in front of the iris.

Apnea: The absence of breathing (respiration).

Aqueous humor: In medicine, humor refers to a fluid (or semifluid) substance. Thus, the aq...

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Atherosclerosis: A process of progressive thickening and hardening of the walls of medium-...

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Autoimmune: Pertaining to autoimmunity, a misdirected immune response that occurs when the...

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Blindness: Loss of useful sight. Blindness can be temporary or permanent. Damage to any p...

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Blood pressure: The blood pressure is the pressure of the blood within the arteries. It is...

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Breathing: The process of respiration, during which air is inhaled into the lungs through ...

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Cardiovascular: Relating to the circulatory system, which comprises the heart and blood ve...

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Chronic: In medicine, lasting a long time. A chronic condition is one that lasts 3 months ...

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Cornea: The clear front window of the eye, which transmits and focuses light into the eye....

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Diagnosis: 1 The nature of a disease; the identification of an illness. 2 A ...

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Dilation: The process of enlargement, stretching, or expansion. The word "dilatation" mean...

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Disc: Shortened terminology for an intervertebral disc, a disk-shaped piece of specialized...

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Diurnal: Occurring in the daytime. A patient may have a diurnal fever rather than a noctur...

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Essential: In medicine, of unknown cause, as in essential hypertension (high blood pressur...

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Fiber: The parts of fruits and vegetables that cannot be digested. Fiber is of vital impor...

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Fundus: In medicine, the bottom or base of an organ. For example, the fundus of the eye is...

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Glaucoma: A common eye condition in which the fluid pressure inside the eye rises to a lev...

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Heart: The muscle that pumps blood received from veins into arteries throughout the body. ...

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Humor: In medicine, a fluid or semifluid substance. For example, the aqueous humor is the ...

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Hypertension: High blood pressure, defined as a repeatedly elevated blood pressure exceedi...

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Hypotension: Any blood pressure that is below the normal expected for an individual in a ...

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Immune: Protected against infection, usually by the presence of antibodies.

Immune system: A complex system that is responsible for distinguishing a person from every...

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Inflammation: A localized reaction that produces redness, warmth, swelling, and pain as a ...

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Intraocular: In the eye. For example, intraocular pressure is the pressure within the eye....

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Intraocular pressure: The pressure created by the continual renewal of fluids within the ...

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Iris: The circular, colored curtain of the eye. The opening of the iris forms the pupil. T...

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Ischemia: Inadequate blood supply to a local area due to blockage of blood vessels leading...

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Laser: A powerful beam of light that is used in some types of surgery to cut or destroy ti...

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Lens: The transparent structure inside the eye that focuses light rays onto the retina.

Microscope: An optical instrument that augments the power of the eye to see small objects....

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Migraine: Usually, periodic attacks of headaches on one or both sides of the head. These ...

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Myopia: Nearsightedness, the ability to see close objects more clearly than distant objec...

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Nearsightedness: The ability to see near objects more clearly than distant objects. Also ...

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Nerve: A bundle of fibers that uses electrical and chemical signals to transmit sensory an...

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Normal range: Characteristic of 95 percent of values from a normal population. The remaini...

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Ocular: Having to do with the eye.

Open-angle glaucoma: Glaucoma is a condition of the eye that leads to progressive atrophy ...

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Ophthalmologist: A physician who practices ophthalmology.

Ophthalmology: The art and science of eye ?medicine.

Optic: Having to do with vision.

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Optic disc: The circular area in the back of the inside of the eye where the optic nerve c...

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Optic nerve: The optic nerve connects the eye to the brain. The optic nerve carries the...

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Overweight: The term "overweight" is used in two different ways. In one sense it is a way ...

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Oxygen: The odorless gas that is present in the air and necessary to maintain life. Oxygen...

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Peripheral: Situated away from the center, as opposed to centrally located.

Peripheral vision: Side vision. The ability to see objects and movement outside of the di...

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Progressive: Increasing in scope or severity, advancing, or going forward. For example, a ...

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Retina: The retina is the nerve layer that lines the back of the eye, senses light, and cr...

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Rule out: Term used in medicine, meaning to eliminate or exclude something from considera...

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Sleep: The body's rest cycle.

Sleep apnea: The temporary stoppage of breathing during sleep, often resulting in daytime ...

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Surgery: The branch of medicine that employs operations in the treatment of disease or inj...

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Syndrome: A combination of symptoms and signs that together represent a disease process.

Thyroid: 1. The thyroid gland. Also, pertaining to the thyroid gland. 2. A p...

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Tonometry: A standard eye test that is done to determine the fluid pressure inside the eye...

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Trauma: A physical or emotional injury.

Ultrasound: High-frequency sound waves. Ultra-sound waves can be bounced off tissues by us...

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Vascular: Relating to blood vessels. For example, the vascular system in the body includes...

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Visual field: The entire area that can be seen when the eye is directed forward, including...

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