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Possible Mechanisms (cont)<br />

Intra-op IOP elevation causing occlusion of<br />

scleral vessels which leads to iris ischemia<br />

Damage to ciliary ganglion during sub-tenon<br />

injection of anesthetics<br />

Abnormalities of the sympathetic nervous<br />

system<br />

Overuse of general anethesia<br />

Intra-op exposure to other toxins

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