detection test for preferential looking for infant or adults with disabilities - grating levels 0.25, 0.5, 1.0, 2.0, 4.0, 8.0 cpcm - 4 paddles printed on both sides - 8" (20.3 cm) diameter [Full description below...]
Description
detection test for preferential looking for infant or adults with disabilities - grating levels 0.25, 0.5, 1.0, 2.0, 4.0, 8.0 cpcm - 4 paddles printed on both sides - 8" (20.3 cm) diameter