[Role of ciliary muscle in ocular physiology and disease]

The ciliary muscle is the largest intraocular muscle. It is characterized by a complex structure, rich blood supply, and high activity, particularly in the daytime, when visual work is performed, and even during night sleep. The activity of the ciliary muscle involves the adjacent structures. In fact, it continuously massages the anterior and median segments of the eye. Presbiopia leads to a decrease in the activity of the ciliary muscle, deteriorates blood circulation in it, and accelerates age-associated involution processes. Presbiopia is believed to be a risk factor for glaucoma, cataract, and some other dystrophic processes. The role of the ciliary muscle in health and disease is still to be investigated.