Table 1.

Details of the participant groups

Group	n	LogMAR	Mean age (range), years
1. Normally sighted	18	0	21.1 (20–25)
2. Mild visual impairment	16	0.1–1	21.7 (18–31)
3. Mid-range visual impairment	12	1.1–2.9	21.1 (17–28)
4. Severe visual impairment	10	3–4	21.9 (18–31)

The number of participants (n), LogMAR [the Logarithm of the Minimum Angle of Resolution, a measure of visual acuity], mean age and range are given for each group. Group 1 were sighted controls. Groups 2, 3 and 4 had mild, mid-range, and severe VI, respectively