Evaluation of the impact of COPD severity grading and oxygen saturation on the retinal nerve fiber layer thickness and subfoveal choroidal thickness in COPD patients

The Egyptian Journal of Bronchology

Table 1 Comparison between the COPD group and the control group regarding RNFL and SFCT parameters

		COPD group (50 cases)	Control group (50 cases)	Test value	P value
		μm	μm	Test value	P value
Superior RNFL	Mean ± SD	93.46 ± 19.18	113.30 ± 6.74	− 6.901	0.001
Superior RNFL	Range	58–126	100–126	− 6.901	0.001
Inferior RNFL	Mean ± SD	96.96 ± 15.48	117.58 ± 12.22	− 7.394	0.001
Inferior RNFL	Range	55–131	100–140	− 7.394	0.001
Nasal RNFL	Mean ± SD	64.30 ± 11.14	78.16 ± 8.72	− 6.929	0.001
Nasal RNFL	Range	40–98	65–96	− 6.929	0.001
Temporal RNFL	Mean ± SD	61.30 ± 14.06	75.82 ± 8.71	− 6.207	0.001
Temporal RNFL	Range	40–93	64–90	− 6.207	0.001
Average total thickness of RNFL	Mean ± SD	79.16 ± 10.49	96.30 ± 4.66	− 10.563	0.001
Average total thickness of RNFL	Range	58–98	87–108	− 10.563	0.001
SFCT	Mean ± SD	213.12 ± 25.61	354.62 ± 53.82	− 16.788	0.001
SFCT	Range	130–245	261–443	− 16.788	0.001

COPD chronic obstructive pulmonary diseases, FEV₁ forced expiratory volume in the first second, RNFL retinal nerve fiber layer, SFCT subfoveal choroidal thickness