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Table 1. 

Details of the Early Blind Participants

No.
Sex
Age
Hand
Education
WAIS III
Etiology
Onset
27 University 51 Retinopathy of prematurity 
46 Higher level 59 Amaurosis congenita von Leber 3 months 
20 Medium level 45 Glaucoma <7 years 
35 Higher level 61 Retinopathy of prematurity 
32 Higher level 54 Retinopathy of prematurity 
37 University 55 Bilateral anophthalmia 
35 Higher level 50 Retinopathy of prematurity 
38 – 58 Amaurosis congenita von Leber <7 years 
42 – 58 Congenital retinitis pigmentosa <7 years 
10 40 Higher level 55 Amaurosis congenita von Leber <1 year 
11 51 University 63 Glaucoma <7 years 
12 34 Higher level 53 Glaucoma <7 years 
No.
Sex
Age
Hand
Education
WAIS III
Etiology
Onset
27 University 51 Retinopathy of prematurity 
46 Higher level 59 Amaurosis congenita von Leber 3 months 
20 Medium level 45 Glaucoma <7 years 
35 Higher level 61 Retinopathy of prematurity 
32 Higher level 54 Retinopathy of prematurity 
37 University 55 Bilateral anophthalmia 
35 Higher level 50 Retinopathy of prematurity 
38 – 58 Amaurosis congenita von Leber <7 years 
42 – 58 Congenital retinitis pigmentosa <7 years 
10 40 Higher level 55 Amaurosis congenita von Leber <1 year 
11 51 University 63 Glaucoma <7 years 
12 34 Higher level 53 Glaucoma <7 years 

Handedness was scored as left-handed, ambidextrous, or right-handed (L/A/R). The educational history of two participants could not be retrieved, but scores on the verbal subtest of the WAIS III indicate that their mental capacities were comparable to the other participants. Several of the blind participants reported that they were able to distinguish between light and dark.

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