Irregular pupil shape dog11/16/2023 ![]() ![]() muscles that contracts/dilates the iris, narrowing/enlarging the diameter of the pupil of the eye. Iris sphicnter muscles, sphincter pupillae and dilator pupillae. the pupil is usually irregular in shape and magnified examination shows evidence of muscle damage. inflammation and trauma to the iris sphincter are other causes of anisocoria. This occurs most commonly among hospital personnel and those exposed to atropine-containing plants. if parasympatholytic (atropine-like) chemicals come in contact with the conjunctiva by accidental (or deliberate!) instillation, they will deactivate the iris sphincter muscle and cause (often very wide) pupil dilation. ptosis is usually present but is always mild (2 mm or less).įor more information on horner's syndrome see ptosis in this section. horner's syndrome causes anisocoria in which the affected pupil is smaller, but both pupils react briskly to light.however, anisocoria is never caused by a third nerve palsy unless there are other signs of a third cranial nerve palsy-ptosis, reduced ocular movements, or ocular misalignment.Ī common cause of isolated anisocoria is a viral infection of the ciliary ganglion (adie's syndrome), an orbital structure that receives the parasympathetic component of the third cranial nerve. ![]() The major concern, as with ptosis, is a third cranial nerve palsy, especially one caused by an aneurysm.
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