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Anomalies in the development of the iris: causes, symptoms, diagnosis, treatment
Medical expert of the article
Last reviewed: 23.04.2024
At the earliest stages of the development of the organ of vision, the developmental defects of the iris can be formed due to the non-opening of the anterior end of the eyeball slit, which is manifested by a defect in the iris, a congenital columboma of the iris. This defect can be combined with the coloboma of the ciliary body and the actual choroid of the eye.
The slit of the eye cup in most cases is closed from below, so the coloboma of the iris is more often formed in the lower parts. The function of the sphincter of the iris remains intact. Coliboma of the iris can be removed surgically: two fine nodal seams are applied to the edges of the defect. The operation leads to an increase in visual acuity and at the same time allows to eliminate the cosmetic defect.
With congenital colobomas of the iris and ciliary body, lens fixation may be impaired due to the lack of a ligamentous device. Over the years, lens astigmatism arises. The act of accommodation is also violated.
Polycery - the presence of several pupils in the iris. A true polycoria is a state where there is more than one pupil in the iris with a conserved reaction to light. False polycore is a pupil in the form of an hourglass due to the fact that the remains of the embryonic pupillary membrane connect the diametrically located edges of the pupil.
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