Most patients undergoing cataract surgery suffer from corneal edema after the surgery. Brimonidine drops are a well known and safe Anti-glaucoma medication. the investigators have made several clinical observations that patients receiving Brimonidine drops had a faster resolution of their corneal edema even if they had normal intra-ocular pressure. The investigators believe that administering topical Brimonidine to patients with significant post operative corneal edema will hasten the resolution of their corneal edema.
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central corneal thickness in micrometer
Timeframe: day 0 (day of enrollment ), day 7, day 30