Table 2.

Distribution of percent change in mean postoperative intraocular pressure (IOP) from mean preoperative IOP. Overall, the cataract surgery group had a 16.5% decrease in mean postoperative IOP from preoperative IOP in the Ocular Hypertension Treatment Study cataract surgery group (n= 63 eyes of 42 participants).

Percent Change in Mean Postoperative IOP from Mean Preoperative IOP*	Number of eyes	Percent of Eyes
≥ 30% Decrease	10	15.9%
20% to 29% Decrease	15	23.8%
10% to 19% Decrease	20	31.7%
0% to 9% Decrease	11	17.5%
Increase from preoperative IOP**	7	11.1%

^*Preoperative IOP was the mean IOP of up to 3 visits prior to split date (e.g., 18, 12 and 6 months prior). Postoperative IOP was the mean IOP of up to 3 visits starting with the visit of the split date (e.g., 0, 6, and 12 months after [with ‘0 months’ equaling the split date]). Percent change is calculated: ((mean postoperative IOP – mean preoperative IOP)/mean preoperative IOP)*100%.

^**7 eyes had an increase in mean postoperative IOP compared to mean preoperative IOP. Percentage increase was 0.7%, 2.8%, 3.2%, 6.4%, 12.3%, 13.4%, and 18.3%.