In testing the visual field, this is the blind area corresponding to the optic disk where the optic nerve fibers exit the eye and where there are no light-sensitive cells.
Glossary of Eye and Vision Terms
Common terms to help you learn more about your eyes and vision
Bulging Eye Disease
Bulging eyes are a symptom of thyroid Eye Disease (TED), sometimes called Graves’ ophthalmopathy or Graves’ Eye Disease, is an autoimmune disease in which the immune system causes inflammation and swelling and stimulates the production of muscle tissue and fat behind the eye. Find out more about thyroid eye disease.
Central Visual Field
The area of objects in space seen without moving the head or eyes; corresponds to an area within 30º of the fixation point (fovea).
Choroid
The middle layer of the eye containing blood vessels that furnish nourishment to the other parts of the eye, especially the retina.
Ciliary Body
A ring of tissue between the iris and the choroid consisting of muscles and blood vessels that changes the shape of the lens and manufactures aqueous humor.
Coats’ Disease
Coats’ disease is a rare eye problem usually affecting only one eye. The disease is not hereditary, mostly occurring in young males, usually before age 15, but can occur later in life. Symptoms may include a pupil with a white appearance, crossed eyes, or poor visual acuity. In Coats’ Disease there are changes to the
Color Vision Deficiency (Color Blindness)
Inability to recognize certain colors, primarily red or green, but rarely blue.
Cones
Cone-shaped light-sensitive cells in the retina particularly in the macula area; cone function predominates in daylight with a small pupil allowing one to make out details and shapes, especially colors.
Congenital
Present at birth.
congenital glaucoma
Congenital/childhood/pediatric glaucoma is glaucoma diagnosed early in a child’s life, as infants or young children. It causes increased intraocular pressure that can damage the optic nerve in the back of the eye. Find out more about glaucoma