Lea Gratings a Preferential Looking Test

LEA GRATINGS are for preferential looking test situations with infants or children and adults with disabilities to determine detection acuity. Grating levels printed on each handle are: 0.25, 0.5, 1.0, 2.0, 4.0 and 8.0 cpcm (cycles per centimeter of surface). Includes instructions and storage case. 4 paddles 8″ (20 cm) in diameter.

In adults visual acuity is measured as "recognition acuity," which uses standard line tests. This type of test cannot be used in examining infants and children with multiple handicaps. Visual acuity in these individuals is measured with grating acuity tests. In this grating acuity test, the infant or child detects the presence of parallel lines of decreasing width, a task simpler than recognizing optotypes. When a striped pattern is presented in front of an infant simultaneously with a gray surface of the same size and luminance, the infant is likely to look at the striped pattern because there is more to see than on a gray surface. The Lea Gratings test uses paddles to present gratings. The handle allows the tester to hold the test easily