CO₂ Laser-Assisted Deep Sclerectomy Surgery Compared with Trabeculectomy in Primary Open-Angle Glaucoma: Two-Year Results

Table 2

Changes in BCVA in two groups before and after the surgery.

Group	Time			Time effect		Group effect		Interaction effect
	Before	After 1 week	After 1 month	F		F		F
CLASS (n = 30)	0.24 ± 0.27	0.28 ± 0.22	0.27 ± 0.24
Trab (n = 47)	0.27 ± 0.32	0.44 ± 0.33	0.31 ± 0.31
	0.67	0.02	0.55	23.14	<0.001	1.39	0.24	12.33	<0.001

BCVA: best corrected visual acuity, LogMAR: logarithmic minimum angle of resolution. Repeated measure ANOVA was used and the Mauchly’s sphericity test P<0.01, so the Greenhouse–Geisser estimation was conducted to calibrate the results. The interaction between group effect and time effect was statistically significant, so a simple effect analysis of the data was further performed