Table 1. Clinical and behavioral data of the vision-impaired and normally sighted subjects.

Subjects	Performance of understanding ultra-fast speech (%)	Age of blindness onset (years)	Duration of blindness related to age (%)	Chrono-logical age (years)	Etiology of blindness	Characterization of visual deficits, in parentheses visual acuity *
102	93	7	78	32	retinal detachment	no residual visual perception (0)
147	86	7	87	52	retinitis pigmentosa	no residual visual perception (0)
108	72	26	16	31	macular degeneration	light perception (0.01)
181	69	13	48	25	optic nerves damaged by a tumor	no residual visual perception (0)
104	67	7	65	20	hereditary vision loss (gene mutation)	no residual visual perception (0)
112	65	44	8	48	retinitis pigmentosa	light perception (0.01)
0Z4	64	37	14	43	glaucoma	no residual visual perception (0)
111	62	24	27	33	retinal damages	no residual visual perception (0)
113	60	17	58	40	uveitis intermedia	residual visual perception (0.03)
0Z9	57	13	52	27	retinal detachment	no residual visual perception (0)
105	39	18	54	39	retinal damages	no residual visual perception (0)
186	35	5	87	38	cataract	residual vision strongly reduced (0.02)
148	3	52	22	67	retinitis pigmentosa	no residual visual perception (0)
0Z5	0	47	8	51	eye cataract, glaucoma	residual vision strongly reduced (0.02)
109	0	45	31	65	retinal damages	no residual visual perception (0)
142	88	-	-	23	n.s.
177	21	-	-	26	n.s.
173	18	-	-	45	n.s.
174	18	-	-	43	n.s.
126	16	-	-	24	n.s.
171	14	-	-	58	n.s.
0Z0	11	-	-	27	n.s.
021	9	-	-	44	n.s.
130	8	-	-	24	n.s.
0Y8	7	-	-	25	n.s.
0Z6	6	-	-	25	n.s.
127	6	-	-	27	n.s.
176	6	-	-	40	n.s.
101	5	-	-	31	n.s.
0Z7	4	-	-	50	n.s.

Italic number indicates a sighted individual who trained to understand ultra-fast speech.

* Visual acuity measures optic resolution in units of 1/minutes of arc, assessed at a distance of 1 m. Values below 0.01 were listed as zero. Abbreviations: n.s. = normally sighted