Glossary of Terms Relating to Glaucoma

Aqueous humor
an ocular fluid that bathes and nourishes the front part of the eye
Glaucoma
an ocular disease associated with damage to the optic nerve that may eventually lead to blindness
Hyperemia
redness of the eye that may be a common, mild side effect of the prostaglandin analogues
Intra-ocular pressure (IOP)
the amount of pressure in the eye. It is measured in units called mm Hg (millimeters of mercury). High IOP is a risk factor for glaucoma and is the main target of therapy
Iris
the coloured part of the eye
Optic nerve
a large nerve located behind the eye that carries visual signals to the brain
Peripheral vision
also known as side vision. This is the area of patients' vision that begins to disappear when they get glaucoma
Tonometry
a common method used to measure IOP
Visual field
a patient's total area of sight. Patients will usually see less area when they get glaucoma. When patients have lost all of their visual field, they are blind.

Information on this page provided by Alcon Canada Inc.