Forty-one children and young adults aged 4 to 25 years (mean 14.5 +/- 6.9, SD) with normal eyes were examined with three different contrast sensitivity tests: the Vistech distance and near test, the Cambridge Low Contrast Gratings test, and the LH-5 Contrast test. In different age groups, the youngest children aged 4 to 9 years had the lowest result values. The results of the older children aged 10 to 15 years and young adults aged 16 to 25 years were close to each other. The range of the results in all tests was large in every age group. The values of contrast sensitivity could not be compared from one test to another; in the Vistech tests the values varied from 10 to 200, in the Cambridge test from 170 to 560, and in the LH-5 test from 5 to 50. Most of the children liked the LH-5 test best, while most of the young adults preferred the Vistech distance test. It is useful to examine children and adults with different contrast sensitivity tests; however, the same test should be used in follow-up examinations.