Anisocoria vs. Horner’s syndrome

Anisocoria vs. Horner’s syndrome

Anisocoria is the medical term for asymmetric (different sized) pupils. It’s similar to the way you might see swelling in your body referred to as edema. Anisocoria can be caused by lots of conditions. Some are temporary, but some can be life-threatening.

Horner’s syndrome is a rare genetic condition that affects the tissue around your eyes. It can cause a drooping eyelid (ptosis), irregular pupils and a lack of sweating on half your face.

Both anisocoria and Horner’s syndrome can be caused by serious, life-threatening conditions like a stroke, brain aneurysm or some cancers. That’s why you should talk to your provider as soon as you notice any changes in your eyes or vision.