Graves' Disease Activity Score (CAS)

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Spontaneous retrobulbar pain +1 point

Pain during eye movement +1 point

Eyelid erythema +1 point

Conjunctival injection +1 point

Conjunctival edema +1 point

Lid swelling +1 point

Eyelid edema +1 point

Score:

A CAS score of ≥3 indicates that TAO is active; the higher the score, the more severe the condition.

CAS, Clinical Activity Score

TAO, Thyroid-associated ophthalmopathy.

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