A member asked:

I had a bad case of optic neuritis in my eye a year ago w/ ms. i notice that pupil is almost always dilated larger still. normal? or cause for concern

5 doctors weighed in across 3 answers
Dr. Mark Fisher answered

Specializes in Neurology

Presumably what happened is that you sustained optic nerve damage & the nerve is not transmitting enough light data to tell the pupil to contract more. The "afferent limb" of the "direct" light reflex is damaged. If a light shined in your other eye causes the dilated pupil to contract, then the "consensual" light reflex is intact. That's called a Marcus-Gunn pupil.

Answered Dec 28, 2016


Dr. Eric Kelts answered

Specializes in Neurology

It is not that unusual to have a persistent pupillary abnormality following optic neuritis. Usually it is only detectable by someone performing a "swinging flashlight test" (usually an eye doctor) but sometimes can be seen by the patient or family member in normal light.

Answered May 21, 2016


Dr. Bennett Machanic answered

Specializes in Neurology

Your eye likely still displays what is called an afferent pupillary defect, and dilates with light exposure. Do not be alarmed. But, if you have a diagnosis of MS, why do you not list an MS disease modifying agent, which would be critical in controlling future issues? Do you not have a neurologist who focuses in MS??

Answered Nov 22, 2014



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