What are furrows in iris?

Contraction furrows (d) are rings that extend around the outer border of the iris. They closely resemble wrinkles and are the product of the contraction and dilation of the pupil. Furrows are typically discontinuous and staggered across the iris.

What are iris crypts?

Crypts are tiny diamond-shaped holes in the iris that can range in size. Furrows are a series of pale lines that curve around the iris, and they’re produced as the pupil opens and closes in response to light.

What is the black dot in the iris called?

They’re made by special cells called melanocytes, which give your skin and your eyes their color. Those cells are usually spread out, but if enough of them clump together, they form a nevus. The other type of eye freckles are called iris freckles. These are tiny flecks in the colored part of your eye.

Does the iris contract?

The iris consists of two sheets of smooth muscle with contrary actions: dilation (expansion) and contraction (constriction). The sphincter muscle of the iris is a circular muscle that constricts the pupil in bright light, whereas the dilator muscle of the iris expands the opening when it contracts.

What do rings in the iris mean?

A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea. It has been suggested that limbal ring thickness may correlate with health or youthfulness and may contribute to facial attractiveness. Some contact lenses are colored to simulate limbal rings.

What are the rings on the iris called?

Circular furrows or rings are concentric to the pupil and are called contraction rings, tetanic rings, spasm rings or cramp rings. Radial furrows are also called radii solaris or iris rays. These signs characterize the spasmodic iris type. Tetanic rings.

What are the circular furrows in the iris called?

Radial or circular furrows embedded in the iris texture. Circular furrows or rings are concentric to the pupil and are called contraction rings, tetanic rings, spasm rings or cramp rings. Radial furrows are also called radii solaris or iris rays.

What is the less affected portion of the iris called?

The less-affected portion of the iris is represented by the posterior pigment epithelium. Aniridia is usually a hereditary bilateral ocular condition associated with multiple congenital ocular and systemic defects.

What can a visual inspection of the Iris tell you?

A visual inspection of a patient’s iris is one of your first opportunities to make a diagnosis. Abnormalities of the iris can result from trauma, infection, neoplasm, or genetic reasons. Iris changes can reflect systemic as well as strictly ocular disease. [1] Image courtesy of Wikimedia Commons.