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| Stage I | Foreign body sensation, reddening of the conjunctiva, onset of itching |
| Stage II | As I, plus lacrimation, more intense itching, reddening of the conjunctiva tarsi of the lower eyelid |
| Stage III | As II, additionally reddening of the conjunctiva tarsi of the upper eyelid, severe itching, blepharospasm |
| Stage IV | As III, additionally chemosis, eyelid swelling, irresistible itching |
