Effects of Laser Peripheral Iridotomy in Subgroups of Primary Angle Closure Based on Iris Insertion

Table 2

Mean difference in the AS-OCT parameters in the two study groups at pre- and post-LPI.

	Pre-LPI		Post-LPI		-value (difference)	-value (difference, ratio)
	NBG	BG	NBG	BG
ACD (mm)	2.100 ± 0.211	2.110 ± 0.301	2.092 ± 0.208	2.113 ± 0.307	0.3624	0.4208
LV (mm)	0.982 ± 0.200	0.889 ± 0.245	1.071 ± 0.234	0.967 ± 0.266	0.1444	0.1511
IC (mm)	0.354 ± 0.077	0.320 ± 0.076	0.131 ± 0.059	0.104 ± 0.045	0.9582	0.2412
IA (mm^2)	1.516 ± 0.268	1.588 ± 0.235	1.632 ± 0.297	1.674 ± 0.246	0.9107	0.8769
ARA750 (mm^2)	0.154 ± 0.081	0.116 ± 0.079	0.193 ± 0.070	0.149 ± 0.088	0.8848	0.1536
TISA750 (mm^2)	0.122 ± 0.063	0.099 ± 0.067	0.164 ± 0.058	0.132 ± 0.073	0.7420	0.0568
AOD750 (mm)	0.229 ± 0.083	0.239 ± 0.098	0.314 ± 0.102	0.284 ± 0.136	0.0584	0.2082
IT750 (mm)	0.359 ± 0.065	0.378 ± 0.082	0.369 ± 0.067	0.381 ± 0.066	0.5110	0.6178

A mixed-effects model was used to compare the pre-post AS-OCT parameter’s mean difference and relative difference between the two groups, adjusted for age, gender, SE, PD and the difference of pre-post-PD.
Abbreviations: AS-OCT: anterior segment optical coherence tomography; BG: basal insertion group; NBG: nonbasal insertion group; ACD: anterior chamber depth; IT₇₅₀: iris thickness from the scleral spur (at 750 m from the scleral spur); IA: cross-sectional area of the iris; IC: iris curvature; LV: lens vault; AOD₇₅₀: angle opening distances (corneoscleral wall 750 m anterior to the scleral spur); ARA₇₅₀: angle recess area formed by the AOD₇₅₀; TISA₇₅₀: trabecular-iris space area, trapezoidal area with the following boundaries: anteriorly, the AOD₇₅₀; posteriorly, a line drawn from the scleral spur perpendicular to the plane of the inner sclera wall to the opposing iris; superiorly, the inner corneoscleral wall; and inferiorly, the iris surface; PD: pupillary distance.