Table 1.

Characteristics of blind participants.

#	Group	Age	Sex	Blindness cause	Blindness onset	BDI	Residual vision	SBSOD score
1	EB	50	M	ROP	~ Birth	1	–	89.52
2	EB	36	F	Glaucoma	6	0.83	LP	89.52
3	EB	30	M	Leber hereditary optic neuropathy	Birth	1	–	62.86
4	EB	31	M	Microphthalmia + glaucoma	Birth	1	LP in one eye	61.90
5	EB	29	M	ROP	~ Birth	1	–	74.29
6	EB	42	M	Retinoblastoma	3	0.93	–	83.81
7	EB	32	M	ROP	~ Birth	1	–	56.19
8	EB	33	M	Septo-optic dysplasia	Birth	1	–	79.05
9	EB	39	F	ROP	~ Birth	1	–	36.19
10	EB	25	M	Malaria	6	0.76	LP	72.38
11	EB	21	M	ROP	~ Birth	1	–	78.10
12	LB*	30	F	Glaucoma	7	0.77	–	78.10
13	LB*	43	F	Sturge-Weber syndrome	8	0.81	–	83.81
14	LB	56	F	RP	24	0.57	–	78.10
15	LB	47	M	Glaucoma	40	0.15	–	74.29
16	LB	45	F	Glaucoma + aniridia	17	0.62	–	80
17	LB	45	M	Accident	17	0.62	–	93.33
18	LB	30	M	Leber amaurosis	18	0.40	–	79.05
19	LB	56	F	RP + glaucoma	32	0.43	LP in one eye	62.86
20	LB	51	M	Accident	17	0.67	–	88.57
21	LB	57	M	Microphthalmia	20	0.65	–	74.29
22	LB	27	M	RP	17	0.37	–	56.19
23	LB	47	F	Diabetic retinopathy	22	0.53	–	74.29
24	LB	73	M	Accident	38	0.48	–	91.43
25	LB	38	F	Glaucoma	20	0.48	–	87.62

BDI, blindness duration index; EB, early blind; F, female; LB, late blind; LP, light perception; M, male; ROP, retinopathy of prematurity; RP, retinitis pigmentosa; SBSOD, Santa Barbara Sense of Direction.

*Participants who were included in the EB group according to the criteria described in the text.