Glossary

ablation – The removal or destruction of tissue.


acuity , visual acuity – Measure of the eye’s ability to distinguish object details and shape. This measurement is usually defined by the smallest detail the person can see at a specified distance (usually 20 feet or 6 meters).


20/20 or 6/6 – Normal visual acuity is identified when a person is able to read on an eye chart at a distance of 20 feet (or 6 meters) what is average to be seen at that distance.


20/200 – A reading of 20/200 on an eye chart means that the person can see at 20 feet what someone with average acuity can see at 200 feet. In the United States “legal blindness” is defined as 20/200 vision.


bilateral – Affecting both eyes.


ciliary processes – The innermost part of the tissue inside the eye. The 70 ciliary processes secrete aqueous fluid and acts as the attachment site for the ligaments that hold up the lens.


dysplasia – Abnormal development or growth of cells, tissues or organs.


electroretinography – Test which provides a measure of retinal functioning caused by light stimulation to the retina.


flourescein angiography (FA) –A test where vegetable based dye is injected into an arm vein, then rapid, sequential photographs are taken of the eye as the dye circulates.


lenticonus– An abnormal cone shaped protrusion of the lens, usually on the front surface.


opaque – A cloudiness which causes the inability of light to go through a normally transparent part in the eye.


mutations – A change in the genetic material passed down from an individiual’s parents.


O.C.T. – generates a cross-sectional image through the retina and gives information not found by F.A.


peripheral vision – side vision.


systemic – Affecting the body generally, rather than a specific area.


ultrasound – A test where the transmission of high frequency sound waves go into the eye and are reflected by the tissue in the eye and displayed on a screen so that the inside parts of the eye can be seen.


unilateral –Affecting only one eye.


vascular – Referring to a blood or lymph vessel.


vasculature – The arrangement of blood vessels in an organ or part.


visually evoked potential or response (VEP or VER) – A computerized test which records the electrical activity in the brain caused by stimulating the retina with light flashes. This test is used to determine whether the eye and brain and working together.