The threshold spatial contrast sensitivity was assessed in children with amblyopia, tapetoretinal abiotrophy, and partial atrophy of the optic nerve of different origin. The measurements were carried out at spatial frequencies of 0.5-22 cycle/grad. Tests with white, red, green, and blue arrays against a black background realized in the Zebra software for IBM computers with VGA or SVGA displays were carried out. Classification of curves representing the contrast sensitivity for the above conditions is proposed. Characteristics of the groups with the above diseases are described, based on the height, shape, and mutual position of the curves.