pH changes of the tear fluid in the conjunctival sac during postoperative inflammation of the human eye

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Abstract
Conjunctival fluid pH was measured pre and post-operatively in 16 patients suffering from senile cataract. We found a significant increase (P < 0.05) from 7.26 .+-. 0.23 (mean .+-. SD) on the day before operation to 7.50 .+-. 0.23 (mean .+-. SD) on the first post-operative day in the conjunctival fluid of the treated eye. Thereafter a gradual decrease towards preoperative level was observed. These changes were not observed in the healthy fellow eye (P > 0.05). No significant pre-operative difference was shown between the two eyes. It is reasonable to assume that the composition of the transudate/exudate from the conjunctival vessels might be responsible for the changes observed.

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