Table 2.

Summary of the data obtained from the control group and from diabetic patients with different levels of retinopathy. Data are presented as mean (SD)

	No retinopathy	Background retinopathy	Preproliferative retinopathy	Proliferative retinopathy	Maculopathy
No	383	110	3	2	12
TCT	42.5 (6.3)	41.7 (7.1)	29.6 (8.5)	21.7 (3.3)	24.0 (7.2)
BCVA (log)	0.06 (0.09)	0.07 (0.09)	0.06 (0.10)	0.09 (0.13)	0.11 (0.11)
Age (years)	61.4 (13.9)	59.0 (13.9)	61.7 (13.1)	45 (18.4)	62.8 (8.8)

BCVA = best corrected visual acuity; TCT = tritan contrast threshold.