"turns the upside down image right side up and ""translates"" said image into ""information.""
innermost-highly vascular. The frontal portion of the choroid layer forms two separate structures: the outer ciliary body and the inner iris. Sheet of light-sensitive nerve cells that contain cones and rods. Each eye has appr. 100 million rods that respond to dim light for black-and-white vision and 7 million cones that perceive and respond to colors in daylight
anterior portion of the sclera. Convex and transparent structure. Allows the passage and refraction of light waves and consist of several layers, the innermost being the Descemet membrane, and the outermost being the Bowman membrane. There are no blood vessels within the sclera, but it does contain pain receptors.
muscular structure that is attached by suspensory ligaments to the lens supporting it. Changes shape to allow the lens to focus.
colored portion of the eye composed of smooth muscle fibers that regulate the diameter of the pupil (an opening in the center of the eye) to adjust for light
found in the retina; each eye has over 100 million and they respond to dim light for black-and-white vision.
lymph-like fluid found in the anterior and posterior chambers of the eye and is secreted by the ciliary body and drains into the venous sinus.
protect the eye structures. Include eyebrows, eyelids, (also called palpebrae), eyelashes, and the ducts that produce tears.
shade the eyes from the sun and prevent perspiration or other objects from getting into the eyes. Also protects the eyeball from desiccation (drying up) by reflexively blinking appr. Every 7 seconds.
thin mucous membrane that lines the interior surface of the eyelid and the exposed surface of the eyeball.
control the movements of the eye and include 6 muscles that arise from the orbit and insert into the outer layer of the eyeball.
4 muscles that maneuver the eyeball in the direction indicated by their names. (superior, inferior, lateral, and medial rectus muscles)
2 muscles, the superior and inferior oblique muscles) rotate the eyeball on its axis.