Table 3.

Mean (SD) of Astigmatism Before and 1 Week, 1 Month, and 3 Months After Shunt and Trabeculectomy Surgeries

	Before Surgery	1 Week After Surgery	1 Month After Surgery	3 Months After Surgery
	Mean ± SD	Mean ± SD	Mean ± SD	Mean ± SD
Trabeculectomy	−1.00±0.59 D*	−6.00±1.9 D P<0.001	−2.21±1.18 D P=0.003	−1.37±0.62 D P=0.059
Shunt	−0.89±0.46 D	−1.56±1.62 D P>0.05	−1.51±1.46 D P> 0.05	−1.07±0.85 D P>0.05

Note: *Diopter unit.