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Coloboma
Table of Contents
Alternative Names

Defination

  • Coloboma - A congenital (present at birth) anomaly in which a portion of a structure of the eye is absent. Usually, the iris, retina, and/or optic nerve.
  • The term coloboma implies the absence of tissue.
  • Typical coloboma usually occurs in the 4th to 6th week of gestation. The notch is usually located towards the bottom of the eye towards the nose in iris coloboma.
  • Iris coloboma - may be in one eye (unilateral) or in both eyes (bilateral). Pupil may be described as an upside down pear shape.
  • Optic disc coloboma - occurs when the coloboma covers the optic nerve. May involve the macula which is responsible for sharp details. This may cause what we know as "white eye" in photographs you take with a camera with flash.
  • Choroidal coloboma is kind of the same as retinal coloboma. The choroid is a highly vascular layer of the eye that lies between the sclera and the retina.
  • Retinal coloboma - a notch or cleft of the retina/part of the retina is missing. Example: 35% of the retina is gone, 65% of the retina is gone or 90% of the retina is gone, depending.
Causes, Incidence and Risk Factors
Prevention
Symptoms
Signs & Tests
Treatment
Expectations (Prognosis)
Complications
Calling your doctor/health care provider

 

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The information contained above is intended for general reference purposes only. It is not a substitute for professional medical advice or a medical exam. Always seek the advice of your physician or other qualified health professional before starting any new treatment. Medical information changes rapidly and while NIO and its content providers make efforts to update the content on the site, some information may be out of date. No health information on NIO, including information about herbal therapies and other dietary supplements, is regulated or evaluated by the Health Ministry of the Government of India and therefore the information should not be used to diagnose, treat, cure or prevent any disease without the supervision of a medical doctor.