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Dr. Stan
Dr. Stan, Ophthalmologist
Category: Eye
Satisfied Customers: 2701
Experience:  Johns Hopkins Fellowship Trained, Certified and Licensed Medical Physician and Surgeon
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What is it when your pupil will not dilate

Resolved Question:

What is it when your pupil will not dilate
Submitted: 7 years ago.
Category: Eye
Expert:  Dr. Stan replied 7 years ago.

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The inability of pupil to dilate with eye drops can be caused by conditions including normal poor variation in the ability of pupil to dilate, old injury to the iris causing poor response to dilating drop; horner's syndrome due to damage to sympathetic nerves at any one of multiple locations from the the neck, back of the eye and/or head, or Adie tonic pupil (due injury to the postganglionic parasympathetic innervation to the pupil). To determine the cause to enable proper treatment I suggest that your eye doctor closely evaluate the above conditions, with tests including Pilocarpine Adie pupil testing.

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