Table 1.

Details of subjects split into three age categories.

	Age category
	<30	≥30 and <60	≥60
Mean age	23 [22, 24]	43 [39, 47]	69 [66, 72]
Age range
Minimum	19	32	60
Maximum	29	59	98
n	18	17	27
SEX
Female	8	9	11
Male	10	8	16
40 cm decimal acuity	1.41 [1.32, 1.51]	1.21 [1.07, 1.34]	0.97 [0.89, 1.06]
Contrast sensitivity	1.97 [1.93, 2.02]	1.95 [1.95, 1.95]	1.92 [1.88, 1.95]
Years of education	18 [17, 19]	20 [19, 22]	15 [14, 16]

The three age categories are arbitrary but often cut-offs at 30 and 60 define younger and older groups in the literature.