Table 5.

Details of the visually impaired participants

Cause of visual loss, VI group	Age (years)	Better eye visual acuity (LogMAR)	Age of onset of visual loss (years)	Early (E) or late (L) onset	Duration of visual loss (years)
Hypoplastic Disc, 2	25	0.40	Birth	E	25
Retinitis Pigmentosa, 2	20	0.40	12	L	8
Neuritis, 2	23	0.40	1	E	22
Stargardt's, 2	24	0.50	6	E	18
Bietti's crystalline dystrophy, 2	31	0.50	4 months	E	31
Retinitis Pigmentosa, 2	21	0.60	Birth	E	21
Retinitis Pigmentosa, 2	19	0.60	17	L	2
Retinitis Pigmentosa, 2	20	0.60	Birth	E	20
Marfan Syndrome, 2	20	0.70	10	L	10
Cone rod dystrophy, 2	18	0.70	Birth	E	18
Nystagmus, 2	20	0.90	Birth	E	20
Amblyopia, 2	18	0.90	Birth	E	18
Retinitis Pigmentosa, 2	25	0.90	14	L	11
Stargardt's, 2	21	1.00	Birth	E	21
Cone dystrophy, 2	18	1.00	10	L	8
Hypoplastic Disc, 2	24	1.00	Birth	E	24
Retinitis Pigmentosa, 3	18	1.10	Birth	E	18
Stargardt's, 3	23	1.10	Birth	E	23
Retinitis Pigmentosa, 3	18	1.10	11	L	7
Healed retinitis, 3	23	1.10	Birth	E	23
Stargardt's, 3	20	1.28	17	L	3
Retinitis Pigmentosa, 3	20	1.28	4	E	16
Cone rod dystrophy, 3	18	1.28	Birth	E	18
Leber congenital amaurosis, 3	22	1.28	Birth	E	22
Stargardt's, 3	27	1.48	Birth	E	27
Retinitis Pigmentosa, 3	28	1.77	6	E	22
Pale disc, 3	17	2.00	Birth	E	17
Pale disc, 3	19	2.30	1.5	E	17.5
Retinitis Pigmentosa, 4	19	3.00	Birth	E	19
Optic atrophy, 4	26	3.00	3	E	23
Optic atrophy, 4	18	3.00	Birth	E	18
Glaucoma, 4	31	3.00	Birth	E	31
Retinal detachment, 4	20	3.00	4	E	16
Glaucoma, Aphakia, Pseudophakia, 4	18	3.00	Birth	E	18
Retinitis Pigmentosa, 4	22	3.50	5	E	17
Phthisical eye, 4	19	3.50	Birth	E	19
Corneal opacity, 4	22	3.50	Birth	E	22
Total corneal opacity, 4	24	4.00	Birth	E	24

The cause of VI, age, age of onset of VI, early (E) or late (L) onset VI, duration of VI, and better eye visual acuity are given for each participant. Groups 2, 3 and 4 had mild, mid-range, and severe VI, respectively