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Relative changes in break-up time of BAK 0.02%, BAK 0.005%, and sodium chloride 0.9% 60 minutes before (T−60) and 30 (T+30), 60 (T+60), and 90 (T+90) minutes after drop application.
Note: *P < 0.05.
Abbreviations: BUT, break-up time; BAK, benzalkonium chloride.
