![]() Different family members may have differently sized pupils. This is a harmless condition where the pupils are different sizes.Īnisocoria can be genetic. Cataracts, glaucoma, and vision loss are common complications. Symptoms of iritis include red, painful eyes, headache, blurred vision, and sensitivity to light. The infection usually develops in one eye, although both eyes can be affected. See your doctor if you notice pigmented spots in your iris or an abnormally enlarged or misshapen pupil. The condition usually has no symptoms, but the tumor may be noticeable during a routine eye exam. This is called an acute angle-closure attack. Narrow-angle glaucoma is considered a medical emergency if the angle becomes completely blocked. It affects the movement of eye fluid, resulting in increased eye pressure. ![]() This condition causes the iris to bulge forward, blocking or narrowing the cornea-iris angle. The ciliary muscle changes the shape of the eye lens to help you see clearly.īelow are common eye conditions that affect the iris and pupil: Narrow-Angle Glaucoma The iris muscles enable the eye to shift focus based on near or far objects. Similarly, it contracts to reduce the amount of light entering the eye when in bright light. The iris regulates the light entering the eye by changing the size of the pupil based on the situation.įor example, when it’s dark, the iris muscles expand the pupils to allow more light into the eye. These are nerves that send signals to the muscles to either contract or expand. This process is also made possible by the sympathetic and parasympathetic nervous systems. The sphincter pupillae make the pupil contract, whereas the dilator pupillae enlarges the pupil. The iris has two types of smooth muscles: sphincter pupillae and dilator pupillae. The change in pupil diameter is made possible by the iris. Drug abuse (e.g., cocaine, heroin, and LSD).Underlying conditions (e.g., headache or double vision).Your emotions (e.g., happiness or sadness).The pupil size may change due to other reasons such as: In the darkness, the diameter may range from 4 to 8 millimeters. A normal adult pupil ranges from 2 to 4 millimeters in diameter in bright light. Nowadays, iris color is an inherited trait. Common eye colors include blue, green, hazel, or brown. When the light is reflected back, it gives the eyes a bluer color.ĭepending on the extent of pigmentation, the color can range from light blue to dark brown. The reduced amount of melanin in the iris allows light to pass through and gets scattered by collagen fibers deeper in the iris. ![]() 3 However, an unusual mutation occurred about 10,000 years ago that turned off the pigmentation on the outer part of the iris. According to scientists, everyone used to have brown eyes. Sufficient amounts of melanin will make your iris brown. The color of your iris depends on the amount of melanin pigment in your iris. ![]() This is what causes different eye colors. 2 However, they produce different amounts of melanin. Melanocytes are found in hair, skin, and the iris of your eyes.Įveryone has the same number of melanocytes. Melanin is a natural skin color produced by cells known as melanocytes. Eye ColorĮveryone, regardless of their eye color, has the same type of melanin pigment. The iris controls pupil size and the amount of light getting into the eye. This is a passage for light as it enters the eye. Within the iris is an opening called the pupil. It also makes the aqueous humor, a clear fluid in the space between your cornea and iris. It consists of muscles that shape the lens when the eye focuses. The ciliary body is located behind the iris. ![]()
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