Factors affecting long-term myopic regression after corneal refractive surgery for civilian pilots in southwest China

Table 1 Demographic, percentages and clinical findings of the subjects in both groups

	Regression group (N = 56)	Non-regression (N = 180)	\( \varvec{t}/{\varvec{x}}^{2}/\varvec{Z}\)	P-value
Gender (M/F)	30/0	88/3		1.000
Age (years)	32.03 ± 3.78	29.18 ± 3.32	3.895	< 0.001
Age at surgery (years)	20.00 (19.00, 24.00)	20.00 (18.00, 22.00)	0.863	0.388
Cumulative flying time (hours)	5,000.00 (2,800.00, 8,200.00)	3,200.00 (1,762.50, 5,500.00)	2.323	0.020
Types of CRS			21.639	< 0.001
LASIK	32(19.2)	135(80.8)
SMILE	10(22.7)	34(77.3)
LASEK	6(40.0)	9(60.0)
PRK	8(80.0)	2(20.0)
Preoperative SE(D)	−3.12 ± 1.16	−2.86 ± 1.09	−1.541	0.125
Postoperative data (at 6 months)
SE(D)	+ 0.80 ± 0.22	0.96 ± 0.26	−4.1706	0.000
CCT	471.48 ± 27.39	478.90 ± 42.09	−1.2393	0.216
Postoperative SE	−1.11 ± 0.85	0.15 ± 0.44	−10.694	<0.001
UCVA	0.48 ± 0.19	0.98 ± 0.08	−19.373	<0.001
IOP (mmHg)	12.76 ± 3.00	12.60 ± 2.85	0.346	0.729
Accommodative test
AA (right eye only,D)	9.07 ± 1.96	10.02 ± 1.94	−3.186	0.002
BAA	8.91 ± 2.00	10.00 ± 1.97	−2.566	0.012
BAF (cpm)	13.00 (8.75, 17.00)	13.00 (9.00, 16.00)	0.079	0.937
MAF (right eye only,D)	13.00 (8.00, 16.00)	12.50 (8.00, 15.00)	0.254	0.799
NRA(D)	1.92 ± 0.71	1.90 ± 0.56	0.187	0.851
PRA(D)	1.83 ± 1.82	2.76 ± 1.78	−2.423	0.017
MEM (right eye only,D)	0.03 ± 0.37	−0.09 ± 0.52	1.517	0.130
MEM	0.04 ± 0.33	−0.11 ± 0.42	1.847	0.067

CRS Corneal refractive surgery, LASIK Laser in situ keratomileusis, SMILE Small incision lenticule extraction, PRK Photorefractive keratectomy, LASEK Laser epithelial keratomileusis, SE Spherical equivalent, UCVA uncorrected visual acuity, IOP Intraocular pressure. AA Accommodative amplitude, BAA Binocular Accommodative amplitude, BAF Binocular accommodative facility, MAF Monocular accommodative facility, MEM Monocular estimated method, PRA Positive relative accommodation, NRA Negative relative accommodation

ISSN: 1471-2415