Long-term follow-up of changes in ocular biometric parameters in orthokeratology lens wearers with relatively large-scale axial length reduction

Table 2 Summary of results at one-year follow-up

Variables	AL reduction group				AL elongation group				P
Variables	Baseline	1 year	P	1-year changes	Baseline	1 year	P	1-year changes	P
AL (mm)	24.99 ± 0.86	24.81 ± 0.86	< 0.001	− 0.18 ± 0.06	24.84 ± 0.87	25.13 ± 0.86	< 0.001	0.28 ± 0.10	< 0.001
CCT (µm)	552.84 ± 22.21	537.11 ± 25.77	< 0.001	− 15.73 ± 10.18	551.21 ± 31.47	537.82 ± 34.00	< 0.001	− 13.39 ± 8.38	0.281
ACD (mm)	3.34 ± 0.19	3.24 ± 0.20	< 0.001	− 0.10 ± 0.08	3.34 ± 0.20	3.32 ± 0.20	0.096	− 0.02 ± 0.07	< 0.001
CLT (mm)	3.45 ± 0.16	3.54 ± 0.18	< 0.001	0.10 ± 0.10	3.39 ± 0.16	3.42 ± 0.15	0.002	0.03 ± 0.06	0.002
VCD (mm)	17.65 ± 0.85	17.49 ± 0.84	< 0.001	− 0.16 ± 0.07	17.56 ± 0.89	17.84 ± 0.89	< 0.001	0.28 ± 0.10	< 0.001
PD (mm)	3.92 ± 0.60	4.07 ± 0.61	0.106	0.15 ± 0.49	3.95 ± 0.55	3.99 ± 0.69	0.520	0.02 ± 0.44	0.279
TZ (mm²)	–	13.72 ± 3.29	< 0.001	–	–	16.44 ± 3.53	< 0.001	–	0.030

AL = axial length; CCT = central corneal thickness; ACD = anterior chamber depth; CLT = crystalline lens thickness; VCD = vitreous chamber depth; PD = pupil diameter; TZ = treatment zone
The changes at one year were calculated by subtracting the baseline from the value after one year of wearing Ortho-K lenses
P was calculated using Student’s t test (paired samples); P was calculated using Student’s t-test (unpaired samples)
Statistical significance was considered at the 0.05 level. Bold text indicates a significant difference (P value < 0.05)

ISSN: 2326-0254