![]() ![]() In short, the choroid is the source of life that keeps the retina functioning effectively. It delivers nourishment (through blood and oxygen supply) to the retina's outer layers. This vascular layer is located between the sclera and retina of your eye. ![]() If any structures become inflamed, the resulting condition is called uveitis. These structures control some eye functions, such as adapting to varying levels of light or object distances. It is located underneath the white part of the eye (the sclera) and is composed of three parts: However, to prevent damage to the cornea and other parts of the eye, you should wear sunglasses.Ĭhronic exposure to UV light may lead to inflammation and other complications, including cancer. This prevents some UV light from reaching other structures inside the eye. The cornea can filter out the sun's harmful ultraviolet (UV) light. This enables it to focus on objects effectively. Considering the dome shaped surface of the cornea, this structure refracts (bends) light as it passes through the eye. In addition to protection, the cornea also plays a significant role in vision. T ogether with the sclera (the white of your eye), the cornea acts as a barrier against dirt, infectious microorganisms, and other substances that can damage the eye. The cornea is the clear and protective outer layer of your eye. Our pupils contract to a small diameter in bright light to protect our retina's delicate photoreceptors. When it's dark, our pupils dilate or expand wider to let in more light. Light enters the eye via the lens, which focuses light rays through the pupils into the retina. The difference between the centers of your pupils is called your pupillary distance. They open and close to regulate the amount of light that enters the eye. The pupil is essentially a hole that allows the eye to focus on the things in front of it. The pupil is seen as a black dot in the center of the iris. This action requires adjusting the pupil's aperture (opening), the shape of the lens, and convergence (the ability of the eyes to work together). The iris also performs what is known as the "accommodation reflex." This is the eye's instinctive ability to shift focus from nearby to distant objects. The iris primarily regulates how much light reaches the retina by controlling the size of the eye's "window," or pupil.Īs a result, it exhibits what is known as a "pupillary light reflex," in which it narrows in bright light while opening up in low light. This structure is located in the front of the eye, between the cornea on the outside and the lens on the inside. The iris is the colored part of the eye and is unique to each person. These conditions can cause redness, eye pain, blurry vision, and lid swelling. 3 If the episclera is inflamed, the resulting condition is known as episcleritis. When the sclera gets inflamed, the condition is referred to as scleritis. The episclera has tiny blood vessels that supply the sclera with nutrients. The episclera is a thin layer of tissue on top of the sclera. This allows the eye to move as needed to see different objects. The sclera provides stability and protection for the eye's inner workings but is also flexible. On the exterior, the sclera is smooth and white, but on the inside, it is brown and has grooves that help properly attach the eye tendons. It covers more than 80% of the eyeball's surface. The sclera is sometimes known as the "whites" of the eye. It also aids in immunological monitoring and prevents microorganisms from entering the eye. Subconjunctival hemorrhages (broken blood vessels)īy generating mucus and tears, the conjunctiva helps lubricate the eyes.Pterygium (a noncancerous growth that develops on the conjunctiva).Pinguecula (accumulation of protein and fat deposits in the conjunctiva).Other eye disorders that affect the conjunctiva include: The conjunctiva also covers the interior of your eyelids.Ĭonjunctivitis, often known as pink eye, occurs when this thin membrane becomes inflamed or swollen. The conjunctiva is the membrane covering the sclera (white portion of your eye). The following are parts of the human eyes and their functions: 1. Eye Anatomy (16 Parts of the Eye & What They Do)
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