full set with 16 cards for testing of infants (6 months to 3 years), low vision or disabled adults - the TAC set includes a Blank and gratings from .23 to 26.0 cpcm - graded gratings: 20/30, 20/40, 20/60, 20/80, 20/100, 20/150, 20/200, 20/300,...
[Read more...]