Paraoptometric CPO - anatomy of the eye terms

Paraoptometric CPO - anatomy of the eye terms Anterior Chamber - The area inside the eye, behind the cornea, and infront of the iris. This area is filled with clear, watery fluid called aqueous humor. Aqueous Humor - A clear, watery fluid produced by the Ciliary body. It provides nutrients for the lens and posterior cornea and carries away waste products. It is also responsible for maintaining the intraocular pressure because it is the only fluid continually produced in the eye. Choroid - It is sandwiched between the sclera and the retina. It consist primarily of blood vessels that nourish the retina. Ciliary muscle - The muscle inside of the eyeball that alters the shape of the crystalline lens. It has the direct control over the focusing ability of the eye. Conjunctiva - The clear tissue that covers the sclera and the inside surface of the eyelids. Cornea - The clear, transparent tissue that is located on the very front (anterior) portion of the eye. Is the most powerful refractive media of the eye. It provides most of the eye's ability to focus light. Crystalline lens - Provides focusing power to the eye. It allows adjustment of the eye to focus from distance objects to near objects. It is the second most powerful refractive medium. Extraocular muscles - Six muscles attached to the sclera from the bones surrounding the eye that serve to aim the eyes in directions we wish to look. Medial rectus muscle - It's only action is to turn the eye towards the nose (adduction). Inferior rectus muscle - It's primary action is to turn the eye downward (depression). Lateral rectus muscle - It's only action is to move the eye away from the nose (abduction). Superior rectus muscle - It's primary action is to move the eye upward (elevation). Fovea centrails - Area in the macula where visual acuity is the sharpest. Contains the highest number of cones. Cones - Photoreceptors that are responsible for daytime vision, color vision, and clear central vision. Sclera - The white portion of the eye made up of a tough, fibrous tissue that give shape and structure to the eyeball. Fundus - The bottom or base of an organ; the interior surface of the eyeball. Iris - The colored part of the eye. Lens - The transparent structure in the eye that focuses light by changes of curvature of its front surface. It is located near the front of the eye, directly behind the pupil Macula - The central part of the retina, which is used for seeing detail. The fovea depression at its center.