The iris (pl.: irides or irises) is a thin, annular structure in the eye in most mammals and birds that is responsible for controlling the diameter and size of the pupil, and thus the amount of light …

2024年7月24日 · The iris is the part of your eye that’s colored. It’s flat and round. Your eye color depends on how much melanin (a naturally occurring pigment) your body makes and certain …

2024年10月31日 · The iris is the colored part of the human eye and a component of the uvea (uveal layer or uvea coat). The uvea is a pigmented layer found between the retina and the …

2024年11月4日 · The iris is the colored part of the eye that controls the amount of light that enters into the eye. It is the most visible part of the eye. The iris lies in front of the crystalline lens and …

2024年10月22日 · The iris is the colored, muscular curtain of the eye. Located between the cornea and lens, the iris regulates how much light gets into the eye by dilating and …

2023年4月29日 · Behind the anterior chamber is the eye’s iris (the colored part of the eye) and the dark hole in the middle called the pupil. Muscles in the iris dilate (widen) or constrict (narrow) …

2022年1月2日 · Eye color is determined by the amount of melanin in the iris. People with a high concentration of melanin have dark brown eyes, those with medium amounts have green …

2025年2月18日 · iris, in anatomy, the colored muscular part of the eye surrounding the pupil, the small black opening in the center. The iris is located in front of the lens and behind the cornea …

2023年6月12日 · The iris is the circular coloured part of the eye. It is part of the vascular layer of the eye - the other two components are the choroid and the ciliary body. The central opening …

2025年1月22日 · The iris is the colored, ring-shaped structure in the eye that surrounds the pupil. It contains pigments that determine eye color, ranging from shades of brown to blue, green, …