Table 8.

Preoperative and Postoperative Visual Field MD (dB) Compared by Mixed-Effects Regression Model.

Periods	Total			µLOT Alone			µLOT + Cataract Surgery
	No. Eyes	Mean ± SD (Range)	p Value ‡	No. Eyes	Mean ± SD (Range)	p Value ‡	No. Eyes	Mean ± SD (Range)	p Value ‡
Preoperative	522	−12.5 ± 8.0 (−30.98, +1.55)		152	−12.3 ± 8.5 (−30.03, +0.75)		370	−12.6 ± 7.9 (−30.98, +1.55)
12 months	237	−10.8 ± 8.2 (−31.82, +3.00)	<0.0001	61	−10.2 ± 7.8 (−30.44, +0.60)	0.1148	176	−11.0 ± 8.3 (−31.82, +3.00)	0.0005
24 months	115	−10.5 ± 8.1 (−29.80, +1.99)	0.0011	32	−12.3 ± 9.1 (−29.80, −0.89)	0.3891	83	−9.8 ± 7.7 (−29.39, +1.19)	0.0060
36 months	41	−7.83 ± 7.7 (−23.31, +1.33)	0.0588	11	−9.7 ± 7.7 (−22.35, −0.35)	0.7044	30	−7.14 ± 7.8 (−23.31, +1.33)	0.0005
Final visit	406	−11.9 ± 8.2 (−31.49, +1.33)	<0.0001	111	−12.8 ± 8.9 (−31.49, +0.60)	0.9069	295	−11.6 ± 7.9 (−30.35, +1.33)	<0.0001
		p = 0.0247 †			p = 0.6145 †			p = 0.0130 †

Data are expressed as means ± standard deviations (range). † p values are calculated using the mixed-effects regression model. ‡ p values are calculated using the paired t-test between preoperative and respective time period values. Abbreviations: µLOT, microhook trabeculotomy; SD, standard deviation.