Iris Belt Ciliary

The iris ciliary belt is a part of the iris of the eye located outward from the Krause area. It contains fibers of the pupillary dilator, a circular muscle that dilates the pupil, regulating the amount of light entering the eye.

The ciliary girdle consists of smooth muscle cells innervated by the autonomic nervous system. When the retina is illuminated, the parasympathetic nerves stimulate contraction of the pupillary dilator muscles, dilating the pupil. In the dark, the sympathetic nervous system, on the contrary, causes the sphincter of the pupil to contract, narrowing the pupil.

Thus, the ciliary girdle of the iris plays an important role in regulating the amount of light entering the eye to optimize vision under different light conditions.



Iris ciliary belt (ligamentum ciliare) is a part of the iris that is located outward from the Krause area and contains fibers of the dilator (muscle ring) of the pupil. This belt is about 0.1 mm thick and is a continuation of the fibers of the ciliary muscle, which are attached to the anterior surface of the iris.

The appearance of the cingulate iris is associated with an evolutionary process that began during the breeding season of reptiles, when they began to use their eyes for hunting. During this period, the iris belt was necessary to protect the eye from damage during hunting.

Currently, the iris belt plays an important role in maintaining the shape of the pupil and maintaining its normal size. It is also involved in the regulation of intraocular pressure and ensures stability of the shape and size of the pupil. In addition, the iris belt may be involved in regulating light levels and color perception.

Diseases associated with the ciliary belt of the iris can manifest themselves in the form of changes in the shape of the pupil, dysregulation of intraocular pressure, and also a decrease in visual acuity. Such diseases include glaucoma, diabetic retinopathy, aphakia and others.

Various methods are used to treat diseases associated with the iris belt, such as medication, laser therapy, surgery and others. However, in most cases, treatment is aimed at eliminating the underlying cause of the disease.

Thus, the iris ciliary belt is an important element of the eye, which plays a key role in regulating visual functions and maintaining eye health. Knowledge of its functions and possible diseases can help in the prevention and treatment of eye diseases.