Thinner Central Corneal Thickness is Associated with a Decreased Parapapillary Vessel Density in Normal Tension Glaucoma

Table 2

Clinical parameters of the NTG and control groups.

Variable	NTG (n = 124)	Control (n = 68)	value^a
CCT (µm)	533.97 ± 33.11	546.78 ± 38.21	0.022
AL (mm)	24.56 ± 1.18	24.16 ± 1.03	0.016
VF MD (dB)	−6.45 ± 6.70	−1.45 ± 2.75	<0.001
VF PSD (dB)	6.65 ± 4.44	2.97 ± 2.59	<0.001
VD RPC (%)	45.51 ± 7.36	50.69 ± 3.52	<0.001
VD RPC SN (%)	43.16 ± 7.30	46.47 ± 5.53	0.001
VD RPC ST (%)	48.32 ± 8.56	52.83 ± 4.46	<0.001
VD RPC IN (%)	43.33 ± 9.89	49.95 ± 5.07	<0.001
VD RPC IT (%)	44.73 ± 14.17	55.79 ± 5.89	<0.001
MVD sup (%)	41.10 ± 5.70	44.76 ± 4.01	<0.001
MVD deep (%)	48.22 ± 4.69	50.30 ± 3.84	0.002
RNFL (µm)	84.75 ± 14.29	98.15 ± 8.64	<0.001
RNFL SN (µm)	94.39 ± 21.81	106.56 ± 16.88	<0.001
RNFL ST (µm)	112.73 ± 27.04	134.21 ± 14.05	<0.001
RNFL IN (µm)	91.15 ± 20.22	108.19 ± 19.59	<0.001
RNFL IT (µm)	107.24 ± 30.60	137.54 ± 17.94	<0.001
GCC (µm)	85.10 ± 12.12	94.25 ± 5.81	<0.001

^aComparison of two groups using independent t-test. CCT: central corneal thickness; AL: axial length; VF MD: visual field mean deviation; VF PSD: visual field pattern standard deviation; VD: vessel density; RPC: radial peripapillary capillary network; SN: superior nasal sector; ST: superior temporal sector; IN: inferior nasal sector; IT: inferior temporal sector; MVD sup: superficial macular vessel density; MVD deep: deep macular vessel density; RNFL: retinal nerve fiber layer; GCC: ganglion cell complex.