What is iris coloboma?

Coloboma of the iris is a hole or defect of the iris of the eye. Most colobomas are present since birth (congenital). A cat eye is a type of coloboma. Any defect in the iris that allows light to enter the eye, other than through the pupil, is called a coloboma.

What is the cause of iris coloboma?

“Typical” iris colobomas are located in the inferonasal quadrant. They are caused by failure of the embryonic fissure to close in the 5th week of gestation, resulting in a “keyhole-shaped” pupil. They may be associated with colobomas of the ciliary body, choroid, retina, or optic nerve.

Can people with iris coloboma see?

Colobomas may be present in one or both eyes and, depending on their size and location, can affect a person’s vision. Colobomas affecting the iris, which result in a “keyhole” appearance of the pupil, generally do not lead to vision loss.

Where is coloboma most common?

The most common colobomas develop in the iris (the colored part of the eye) and cause the pupil (the dark center of the eye) to have a keyhole or cat-eye shape….Colobomas can develop in almost any part of your child’s eye, including their:

• Iris.
• Retina.
• Optic nerve.
• Macula.
• Ciliary body.
• Eyelid.

What does a person with coloboma see?

Coloboma can affect your iris, the tissue that gives you your eye colour. Your pupil may look oval if the coloboma is partial, but if more of your lower iris is missing, your pupil will look more keyhole shaped. Both children and adults with only iris coloboma will probably have fairly good vision.

What does a coloboma look like?

A uveal coloboma can look like a notch in the colored part of the eye.

Is coloboma a birth defect?

In many patients, a coloboma is accompanied by microphthalmia and anophthalmia, or other defects in various parts of the body. Colobomas are present in 0.5–7.5 per 10,000 births, and can be caused by a genetic mutation or by toxic environmental factors. Coloboma is an eye abnormality that occurs before birth.

Can coloboma cause lazy eye?

Children who have coloboma in only 1 eye may need to wear an eye patch or use special eye drops to prevent amblyopia (lazy eye). Children and adults may need treatment for other eye conditions related to coloboma, such as cataracts or glaucoma.

How common is iris coloboma?

Ocular coloboma is relatively uncommon, affecting less than one in every 10,000 births. The classical description in medical literature is of a keyhole-shaped defect. A coloboma can occur in one eye (unilateral) or both eyes (bilateral). Most cases of coloboma affect only the iris.

Are people with coloboma blind?

Some people with coloboma have no symptoms. Others may have problems with their vision, including: Vision loss or blindness. Low vision.

Can you drive with coloboma?

Many people living with coloboma won’t experience reduced vision and should have no problems with driving. Even if your vision is affected, you may be able to drive if your sight is good enough.

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