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Cat eye
Cat eye


Coloboma of the iris
Coloboma of the iris


Definition:

Coloboma of the iris is a congenital (present since birth) defect of the iris of the eye.



Considerations:

Coloboma of the iris may appear as a black, round hole located in or next to the colored portion of the eye (iris). It can appear as a black notch of varying depth at the edge of the pupil, giving the pupil an irregular shape. It can also appear as a split in the iris from the pupil to the edge of the iris.

A small coloboma, especially if it is not attached to the pupil, may allow a secondary image to focus on the back of the eye, causing:

The defect may extend to the retina , choroid , or optic nerve.

Colobomas are generally diagnosed at, or shortly after birth.



Common Causes:

Coloboma can occur due to:

  • Eye surgery
  • Hereditary conditions
  • Trauma to the eye

Most cases of coloboma have no known cause and are not associated with other abnormalities. A small percentage of people with coloboma have other inherited developmental abnormalities.



Call your health care provider if:

Contact your health care provider if:

  • You notice that your child has what appears to be a hole in the iris or an unusual-shaped pupil.
  • Your child's vision becomes blurred or decreased.

Note: It is appropriate to see an ophthalmologist for vision problems. Your primary health care provider may need to help rule out disorders associated with coloboma of the iris.



What to expect at your health care provider's office:

The doctor will take a medical history and conduct an examination.

The patient is usually an infant, and the family history will be most important.

The physical examination will include a detailed eye examination, which may involve:

  • Dilated exam
  • MRI imaging of the brain and nerves connecting the eye to the brain

After seeing your health care provider:

You may want to add a diagnosis related to a coloboma to your personal medical record.




Review Date: 11/13/2007
Reviewed By: Manju Subramanian, M.D., Assistant Professor in Ophthalmology, Vitreoretinal Disease and Surgery, Boston University Eye Associates, Boston, MA. Review provided by VeriMed Healthcare Network.

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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Wentworth-Douglass Hospital
789 Central Avenue, Dover, NH 03820
Phone: (603) 742-5252
Toll free: 1 (877) 201-7100