Comparing single and multiple laser-assisted in situ keratomileusis enhancements: Factors influencing recurrence safety and efficacy

Table 1 Laser-assisted in situ keratomileusis results

Variable	Single enhancement group	Multiple enhancement group
Group size (%)	57 eyes (70.7)	23 eyes (29.3)
Mean age (years)	39.9 ± 14.0	43.9 ± 14.8
Time to first enhancement (months)	62.1 ± 40.1	39.7 ± 37.3
Average enhancements per eye (hyperopia-mild)	-	1.43
Average enhancements per eye (hyperopia-severe)	-	1.0
Average enhancements per eye (hyperopia-mild)	-	1.2
Average enhancements per eye (myopia-severe)	-	1.0
Average enhancements per eye (astigmatism-mild)	-	1.34
Average enhancements per eye (astigmatism-severe)	-	2.0
Average enhancements per eye (corneal thickness 450-500 μm)	1.0	1.0
Average enhancements per eye (corneal thickness 500-550 μm)	1.3	1.3
Average enhancements per eye (corneal thickness 550-600 μm)	1.56	1.56
Correlation of corneal thickness with regression risk	-0.0063	-0.0063

Table 2 Safety outcomes and documented complications following laser-assisted in situ keratomileusis enhancement (n = 80 eyes), n (%)

Category	Event	n/80 eyes
Intraoperative	Any intraoperative complication	2 (2.5)
Intraoperative	Overcorrection/steep keratometry noted	1 (1.3)
Intraoperative	Pre-existing corneal scar affecting outcome (documented intra-op)	1 (1.3)
Postoperative	Any postoperative complication	6 (7.5)
Postoperative	Epithelial ingrowth (any)	3 (3.8)
Postoperative	Epithelial cyst (any)	2 (2.5)
Postoperative	Corneal scar affecting optimal outcome	1 (1.3)
Postoperative	Postoperative ectasia	0 (0)