Patti Stripes Grating Paddles – Set of 4
Detection test for preferential looking situations for testing contrast sensitivity in children and infants. Includes six gratings at 0.3, 0.6, 1.2, 2.4, 4.8 and 9.6 CPCM (cycles per centimeter) along with the CPD (cycles per degree) for the three test distances of 25, 50, and 100 cm (10, 20 and 40 in.) printed on the handle. Can be washed with soap and water or cleaned with alcohol. Set of 4 double-sided square paddles.