Impact of coronary artery bypass grafting surgery on the chorioretinal biomicroscopic characteristics

Table 4 Comparison of best-corrected visual acuity, choroidal and macular thicknesses, macular and prepapillary nerve fiber layer thicknesses, arterial and venous caliber before and after coronary artery bypass grafting in diabetic patients

	mean ± SD	Median (range)	P value1
Preoperative BCVA (decimal)	0.75 ± 0.12	0.75 (0.50, 0.90)	> 0.999
Postoperative BCVA (decimal)	0.75 ± 0.13	0.75 (0.50, 1.00)
Preoperative BCVA (logMAR)	0.13 ± 0.07	0.13 (0.05, 0.30)	> 0.999
Postoperative BCVA (logMAR)	0.13 ± 0.07	0.13 (0, 0.30)
Preoperative choroidal thickness	297 ± 51.73	314.5 (183.0, 343.0)	0.532
Postoperative choroidal thickness	298.44 ± 53.61	320 (190, 346)
Preoperative macular thickness	271.56 ± 43.36	262 (240, 426)	0.126
Postoperative macular thickness	273.50 ± 41.83	262 (237, 420)
Preoperative macular NFL thickness	12.13 ± 1.67	12 (8, 14)	0.203
Postoperative macular NFL thickness	12.56 ± 2.37	12.5 (9.0, 17.0)
Preoperative prepapillary NFL thickness	105.50 ± 13.24	98.5 (93.0, 127.0)	0.060
Postoperative prepapillary NFL thickness	106.19 ± 13.99	99.5 (92.0, 129.0)
Preoperative venous caliber	102.30 ± 8.51	102.6 (88.3, 115.3)	0.415
Postoperative venous caliber	101.74 ± 9.73	103.7 (85.0, 114.7)
Preoperative arterial caliber	77.56 ± 7.68	77.8 (68.0, 95.6)	0.363
Postoperative arterial caliber	77.03 ± 8.27	76.45 (65.40, 91.60)

¹Paired t-test.

BVCA: Best-corrected visual acuity; NFL: Nerve fiber layer.