Eye Anatomy and Common Defects Animated Tutorial
How the eye works? The eyeball is roughly a sphere of about one inch in diameter. The main components of the eye include: - The cornea - the cornea is the transparent front part of the eye. The cornea refracts light and accounts for about two-thirds of the eye's total focusing power. - The iris - the iris is the pigmented part of the eye that makes up the eye color. The iris regulates the amount of light that enters the eye by adjusting the size of the pupil - an opening in the center of the iris. - The lens - the crystalline lens is a clear biconvex structure located behind the pupil and helps to focus light further. - Light refracted by the cornea and the lens creates an image of the visual object on the retina.
The retina is a light-sensitive tissue lining the inner surface of the eye. Within the retina, optical information is converted into neural action potentials which are then transmitted to the visual cortex of the brain through the optic nerve. - The fovea is the central part of the retina where the sharpest central vision is achievable. In the normal eye, light rays converge right on the retina. This results in sharp vision.
In myopia, or nearsightedness, a condition in which the eyeball is too long, light rays converge before they reach the retina. The focal plane is located in front of the retina resulting in blurry vision. This happens when the person is looking at faraway objects. In hyperopia, or farsightedness, a condition in which the eyeball is too short, light rays have not yet converged when they reach the retina. The focal plane is located behind the retina resulting in blurry vision. This happens when the person is looking at nearby objects.
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