Patti Stripes consists of 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.
Set includes four paddles, three with gratings printed on both sides and one solid gray face for presentation.
Extremely durable made from 4 mm plastic.
Can be washed with soap and water or cleaned with alcohol.
These will hold up to years of service.
Patti Stripe paddles are highly useful for testing the contrast sensitivity of children, infants, and those with mental disabilities. The contrast sensitivity is tested by placing the gray paddle in front and the grated paddle behind and sliding it out. If the child can see the grating or contrast level, they will respond by following the paddle. The set includes seven separate CPCM gratings that help to establish a contrast sensitivity level in pediatric patients.