Vistech Contrast Sensitivity Chart -

4 assessment of vision in infants and children visual - limitations the regulations indicate the importance of evaluating the young child relative to test norms and to age in section 416 926a functional equivalence for children of 20 cfr ch iii 4 1 99 edition marked and extreme limitations are defined relative to test norms with a marked limitation being a score that is 2 but 3 standard deviations below the norm for the