Tear Lipid Layer Thickness in Children after Short-Term Overnight Orthokeratology Contact Lens Wear

Table 4

Association of LLT average and other variables of 56 orthokeratology eyes at baseline.

		LLT average (nm)	Age (years)	Sex	Sph (D)	Cylin (D)	Axis	BCDVA logMAR	Axial length(mm)	K1 (D)	K2 (D)	TCT (um)
Number of cases (n)		56	56	56	56	56	56	56	56	56	56	56
Average		54.29	10.30	—	−2.90	−0.42	95.95	−0.02	24.82	42.77	43.91	550.79
Standard deviation		22.13	1.75	—	1.12	0.48	83.81	0.04	0.70	1.07	1.12	26.16
Association with LLT average	r	—	−0.03	−0.38	0.07	0.06	0.34	0.04	0.03	−0.74	−0.67	−0.21
	P	—	0.82	0.00	0.63	0.66	0.04	0.76	0.82	0.59	0.621	0.12
	n	—	56	56	56	56	37	56	56	56	56	56

LLT: lipid layer thickness. Sph: spherical power. Cylin: cylindrical power. BCDVA: best corrected distance visual acuity. K1: flat corneal curvature. K2: steep corneal curvature. TCT: thinnest corneal thickness. Blink: number of blinks during 19.5 s. Partial blink: number of partial blinks during 19.5 s.