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The average of IOP fluctuation at each 1-hr period before and after AIT (single-surgery group).
Notes: Dotted line: before the AIT surgery. Solid line: After AIT surgery. Before AIT, the line of falls rapidly at 5:00 a.m. The IOP fluctuation was smaller before AIT than after AIT during the nocturnal periods.
Abbreviations: AIT, ab interno trabeculectomy; IOP, intraocular pressure.
