Table 1.

Demographic characteristic of the blind participants

Subject number	Education	Gender	Age	Etiology	Onset age of blindness
Early-onset blind group (N = 15)
1	Vocational education	M	20	Congenital glaucoma	Birth
2	Vocational education	F	30	Retintis pigmentosa	Birth
3	Secondary school	F	29	Retintis pigmentosa	1 year
4	High school	M	38	Optic nerve damage	Birth
5	Vocational education	M	28	Congenital cataract	Birth
6	High school	F	20	Congenital optic atrophy	Birth
7	Vocational education	F	26	Congenital optic atrophy	Birth
8	Vocational education	M	31	Congenital cataract	<1 year
9	Vocational education	M	28	Optic nerve damage	Birth
10	Vocational education	F	30	Retintis pigmentosa	Birth
11	Secondary school	M	26	Congenital optic atrophy	Birth
12	High school	F	30	Retintis pigmentosa	<1 year
13	Secondary school	M	32	Congenital glaucoma	Birth
14	Vocational education	M	36	Optic nerve damage	Birth
15	Vocational education	F	30	Congenital glaucoma	<1 year
Late-onset blind group (N = 17)
1	College	M	32	Optic nerve damage	30
2	Vocational education	M	35	Glaucoma	26
3	Vocational education	M	38	Ocular fundus disease	5
4	College	M	28	Cataract	22
5	High school	M	38	Retinal detachment	36
6	Vocational education	M	29	Glaucoma	18
7	Secondary school	M	49	Optic nerve damage	39
8	Vocational education	M	28	Optic nerve damage	18
9	High school	M	28	Retintis pigmentosa	13
10	High school	M	43	Retintis pigmentosa	33
11	Secondary school	M	34	Optic nerve damage	15
12	Secondary school	M	27	Cataract	15
13	High school	M	32	Retinal detachment	22
14	Vocational education	F	30	Retinal detachment	9
15	Vocational education	M	20	Retintis pigmentosa	9
16	Secondary school	F	27	Retinal detachment	7
17	Secondary school	M	33	Retinal detachment	30