Ganglion cell complex and retinal nerve fiber layer thickness in predicting visual outcome in brain tumors after surgery

Table 5 Association of visual impairment with retinal nerve fiber layer and ganglion cell complex thickness, at baseline and final follow-up, mean ± SD

		Mild visual impairment (6/6-6/18)	Moderate impairment (6/18-6/36)	Severe impairment to blind (6/36-3/60)	P value
Preoperative
RNFL thickness in micron	Superior	128.06 ± 65.91	98.17 ± 24.37	66.06 ± 18.34	< 0.01
	Inferior	123.41 ± 54.42	103.67 ± 24.42	64.76 ± 27.67	< 0.01
	Nasal	74.96 ± 34.56	59.67 ± 18.14	52.29 ± 20.57	< 0.05
	Temporal	55.89 ± 21.23	42.83 ± 7.81	42.7 ± 11.08	< 0.05
Mean GCC thickness in micron		70.5 ± 13.6	58 ± 10.02	55.29 ± 13.51	< 0.01
Postoperative (six-month follow-up)
RNFL thickness in micron	Superior	105.98 ± 29.84	95.25 ± 28.06	63.18 ± 17.95	< 0.01
	Inferior	102.61 ± 27.51	101 ± 38.84	61.54 ± 23.1	< 0.01
	Nasal	63.2 ± 15.28	69.75 ± 9.18	52.18 ± 21.64	0.08
	Temporal	53.2 ± 9.19	46.5 ± 8.18	47.54 ± 12.89	0.12
Mean GCC thickness in micron		69.9 ± 12.67	67.25 ± 16.98	47.54 ± 16.26	< 0.01

GCC: Ganglion cell complex; RNFL: Retinal nerve fiber layer.