Coloboma Figure 2

Figure 2: Suspected coloboma of the iris (bilateral) in female rat (Jessie).
Case history and photos


Jessie (intact female rat), a standard eared, brown-eyed husky was adopted from a rat rescue in April 2010. She was guessed to be about 1 year old at the time.

Clinical Signs

Owner reported that both of Jessie’s pupils appear to be misaligned: the left pupil points slightly upwards, whereas the right pupil points quite a bit downwards. In addition, the right pupil has an oblong shape. Both eyes appear to have a pupil reflex (to light).


Suspected coloboma (unconfirmed by veterinarian).




Jessie continues to be a very inquisitive and active rat, and appears to be completely unaffected by her odd pupils.



Unconfirmed bilateral colobomas of the iris.

Case history and photos courtesy of Cyzahhe


Linked from


The Rat Guide and its affiliates accept no responsibility for misuse or misunderstanding of its information. This guide in whole or part, exists solely for the purpose of recognizing and understanding the care and illnesses in the pet rat. Please seek advice and treatment from a qualified Veterinarian if your rat is ill.

2000 - 2023 by Karen Grant RN. All rights reserved.
All other written and visual materials used by permission of specific authors for the sole use of the Rat Guide. Please visit our Privacy Policy for details.
Brought to you by KuddlyKorner4u
See Logos page for linking to the Rat Guide.
Contact us here: Rat Guide Team
Please note: Rat Guide email is not checked daily. Send e-mail to if you have an urgent medical problem with your pet rat. When possible, it is always best to take your rat to a qualified rat veterinarian.