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... To evaluate the impact of virtual environments on blind children's cognition, researchers used a set of cognitive tests validated and adapted to the children's cognitive level and to the degree of their blindness. The Precalculus Test (Milicic & Schmidt, 2003) and Mathematics Knowledge Test of Benton & Luria, adapted for children with special needs by Chadwick & Fuentes (1980), were used to evaluate the impact of AudioMath and The Farm of Theo & Seth on the learning and practice of mathematical concepts. The purpose of the Precalculus Test is to measure the development of the mathematical skills of first-grade learners. ...