H21: Other disorders of iris and ciliary body

H21.4: Pupillary membranes

The colored iris is located in the center of the eye. There is a black opening in the center of the iris. This is the pupil. The iris also controls how big the pupil is.

The area around the pupil can change in different ways. Adhesions or fine membranes have formed in the area around your pupil. These adhesions can close the opening between different parts of the eye. This means the fluid inside the eye cannot drain properly. The pressure inside the eye can then increase.

Increased pressure in the eye can lead to a person not being able to see as well as they normally can or their eye becoming very sore. The high pressure in the eye can also result in the iris protruding forwards and becoming deformed. This can be seen in the eye from the outside.