Iris and Anterior Chamber
Anatomy of the Iris
The iris plays a vital role in regulating light entry and ensuring optimal vision. Its anatomy, including muscles and pigments, contributes to its function in the anterior chamber of the eye.
Iris and Anterior Chamber: Anatomy of the Iris
The iris is a key structure within the anterior chamber of the eye, responsible for controlling the amount of light entering through the pupil. It plays a crucial role in vision by adjusting to different lighting conditions.
Anatomy of the Iris
The iris is a circular, pigmented structure situated between the cornea and lens. It comprises two layers: the anterior stroma and the posterior pigmented epithelium.
Key Components
- Stroma: Contains fibroblasts, melanocytes, and blood vessels.
- Sphincter Pupillae: A muscle that constricts the pupil.
- Dilator Pupillae: A muscle that dilates the pupil.
- Pigmented Epithelium: A layer that absorbs excess light.
Physiological Role
The iris regulates pupil size in response to light intensity, helping optimize visual acuity and protect the retina from excessive brightness.
Common Disorders
- Iritis: Inflammation of the iris, often causing pain and blurred vision.
- Coloboma: A congenital defect leading to a misshapen pupil.
- Aniridia: Partial or complete absence of the iris.
Understanding the iris's anatomy and function is essential for diagnosing and treating ophthalmic conditions effectively.
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