Chapter 17 Vocabulary - The Eye Flashcards
Normal adjustment of the eye to focus on objects from far to near.
Accommodation
Area behind the cornea and in front of the lens and iris; contains the aqueous humor.
Anterior Chamber
Fluid produced by the ciliary body and found in the anterior chamber.
Aqueous Humor
Consisting of two surfaces that are rounded, elevated, and curved evenly, like part of a sphere. The lens of the eye is a biconvex body.
Biconvex
Middle, vascular layer of the eye, between the retina and the sclera.
Choroid
Structure surrounding the lens that connected the iris to the choroid. Contains ciliary muscles, which control the shape of the lens, and it secrete aqueous humor.
Ciliary Body
Photoreceptor cell in the retina that transforms light energy into a nerve impulse. Responsible for color and central vision.
Cone
Delicate membrane lining the eyelids and covering the eyeball up to the cornea.
Conjunctiva
Fibrous transparent layer of clear tissue that extends over the anterior portion of the eyeball.
Cornea
Tiny pit or depression in the retina that is the region of clearest vision.
Fovea Centralis
Posterior, inner part of the eye; visualized with an ophthalmoscope.
Fundus of the eye
Pigmented (colored) layer that opens and closes to allow more or less light into the eye.
Iris
Transparent, becomes body behind the pupil of the eye. It bends (refracts) light rays to bring them into focus on the retina.
Lens
Small oval region on the retina near the optic disc; contains the fovea centralis which is the area clearest vision.
Macula
Point at which optic nerve fibers cross in the brain.
Optic Chiasm
Region at the back of the eye where the optic nerve meets the retina.
Optic disc
Cranial nerve carrying impulses from the retina to the brain.
Optic Nerve
Central opening of the eye, surrounded by the iris, through which light rays pass. It appears dark.
Pupil
Bending of light rays by the cornea, lens, and fluids of the eye to bring the rays into focus on the retina.
Refraction
Light-sensitive nerve cell layer of the eye containing photoreceptor cells (rods and cones).
Retina
Photoreceptor cell of the retina essential for vision in low light and for peripheral vision.
Rod
Tough, white outer coat of the eyeball.
Sclera
Relay center of the brain.
Thalamus
Soft, jelly-like material behind the lens in the vitreous chamber; helps maintain the shape of the eyeball.
Vitreous Humor
