The angle of the iris is a crucial feature of the eye's anatomy that determines the flow of aqueous humor and regulates intraocular pressure. In its spelling, the word "angle" is pronounced /ˈæŋɡəl/, with a stress on the first syllable and a hard "g" sound. Meanwhile, "iris" is spelled /ˈaɪrɪs/, with a stress on the second syllable and a long "i" sound. When combined, the word-to-pronounce becomes /ˈæŋɡəl ʌv ðə ˈaɪrɪs/ - a term that is important for ophthalmologists to recognize and understand.
The term "angle of the iris" refers to a specific anatomical structure within the eye that is associated with the drainage system of the aqueous humor, which is the clear fluid located between the cornea (the transparent outer layer of the eye) and the lens (the structure responsible for focusing light onto the retina).
The angle of the iris is formed by the junction between the cornea and the iris, which is the colored part of the eye. This angle houses the trabecular meshwork, a delicate network of tissue responsible for draining the aqueous humor from the eye. The drainage of fluid in this area is crucial for maintaining a healthy intraocular pressure, necessary for proper eye function.
The angle of the iris can be categorized into two main types: open and closed angles. In an open angle, the trabecular meshwork is easily visible, allowing for normal drainage of the aqueous humor. Conversely, in a closed angle, the iris physically blocks the drainage system, causing a buildup of fluid and subsequent elevation of intraocular pressure. This condition, known as angle-closure glaucoma, can be sight-threatening if left untreated.
The angle of the iris plays a vital role in eye health and is regularly assessed during ophthalmic examinations, especially when evaluating the risk of glaucoma. Early detection and appropriate management of any abnormalities related to the angle of the iris are crucial for preserving vision and preventing complications associated with elevated intraocular pressure.
The angle between the iris and the cornea at the periphery of the anterior chamber of the eye.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.