Table 1. Clinical characteristic of the three groups of children examined (dyslexic, D 10–12; non dyslexic children reading age matched, ND 7–9; and non dyslexic children chronological age matched, ND 10–12).

	TNO	NPC	Heterophoria	Divergence	Convergence
D 10–12	55	2	Exo 3.5	10	24
ND 7–9	48	2	Exo 2	16*	38*
ND 10–12	35	2	Exo 2	12	39*

Mean values of: binocular vision (Stereoacuity test, TNO measured in seconds of arc; near point of convergence, NPC measured in cm; Heterophoria at near distance measured in prism diopters; Exo = exophoria; Vergence fusional amplitudes (divergence and convergence) at near distance measured in prism diopters. Asterisks indicate that value is significantly different with respect to the group of dyslexic children (p≤0.01).