Enhanced Surgical Safety through Protective Penetrating Keratoplasty: A Retrospective Analysis of 22 Cases

Table 1

Central tendency and dispersion measure values for preoperative and postoperative visual acuity.

Indicators	CDVA
	Preoperative	Postoperative
N	22	22
Mean (SD)	0.050 (0.000)	0.341 (0.200)
95% CI	0.050–0.050	0.252–0.430
Median	0.050	0.300	≤0.001
IQR	0.000	0.300

Wilcoxon test for related samples (before and after) for distribution comparison. N: count; SD: standard deviation; CI: confidence interval; IQR: interquartile range; CDVA: corrected distance visual acuity.