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
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.
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
Conjunctiva
Delicate tissue that lines the inside of the eyelids and covers the front part of the eye except the cornea.
Cornea
The clear curved structure that comprises the front of the eye, a refractive surface through which light enters.