Two Techniques to Evaluate Visual Acuity from the Age of 18 Months

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Abstract
Two methods to measure visual acuity in children aged 18 months and upwards are described, the Kolt-test and the O-test. The validity of the tests was evaluated. These new tests are based on the ability of small children to identify symbols of increasing complexity as they grow older. Thus, a circle is recognized at 12 months, and a cross at about 24 months, while recognition of a triangle and a square comes in between. Correct performance is rewarded. Simplified procedures permit testing children with visual acuity below 0.1 (6/60, 20/200). The tests may also be used in mentally retarded persons if conventional methods fail.