Table 1.

The different combinations of numbers and physical sizes according to distance

Distance	Number stimuli	Physical stimuli*
1	1-2, 3-4, 6-7, 8-9	40–44, 48–52, 56–60, 67–76
2	1-3, 2-4, 6-8, 7-9	40–48, 44–52, 56–67, 60–76
5	1-6, 2-7, 3-8, 4-9	40–56, 44–60, 48–67, 52–76

* Font sizes from a viewing distance of approximately 50 cm