Introduction to The Eye
Our eyes allow us to appreciate the beauty of the world, experience the joy of learning new activities and undertake new adventures. The entire staff of 20/20 Optometric Eye Care wants to share this educational video on the anatomy of your eyes in hopes that it will provide our patients with a better understanding or the importance of having routine eye exams. We have created this introduction to the eye because we believe knowing the anatomy of your eyes and having regular examinations is the best way to keep your eyes healthy and your vision intact.
The Sclera, also known as the white of the eye, is the opaque, fibrous, protective, outer layer of the eye.
The Iris is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil. The color of the iris is often referred to as "eye color."
The Eyelid includes the upper and lower muscular folds of skin that move to cover and uncover the eyeball.
The Optic Nerve includes a pair or cranial nerves, consisting of sensory fibers that transmit sight impulses to the brain.
The Crystalline Lens is a transparent, biconvex structure that, along with the cornea, helps to refract light to be focused on the retina. By changing shape, the lens functions to change the focal distance of the eye so it can focus on objects at various distances.
Pupil is a hole located in the center of the iris that allows light to enter the eye. It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil.
The Retina is a light-sensitive layer of tissue, lining the inner surface of the eye. It captures light sent through the cornea and crystalline lens to create an image by triggering nerve impulses that pass to various visual centers of the brain via the optic nerve.
The Macula is the areas within the retina that contain rods and cones to determine the color and shape of the image you are viewing. The Fovea is the concave portion of the central part of the retina - usually appears darker in color than the rest of the retina. This area gives us the sharpest vision.
The Cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. The cornea, with the anterior chamber and lens, refracts light, with the cornea accounting for approximately two-thirds of the eye's total optical power. Light passes through the cornea.If it is damaged or scarred, this can distort the image the retina receives. Contact lenses are placed onto the cornea.