Two smaller groups 3.8M to 1.2M for repetitive testing (20/25, 6/7.5 to 20/8, 6/2.4 equiv.).
For use in a clinical setting.
Patti Pics symbols are ideal for testing contrast sensitivity in children. By testing for contrast sensitivity during childhood, early symptoms of visual abnormalities can be detected sooner. Early detection of contrast sensitivity abnormalities leads to more successful diagnosis, therapy and will lead to corrected vision. If patients are not tested during childhood years, many symptoms and signs may be missed and when they are finally noticed in adulthood, problems may be irreversible and ultimately not repairable. Childhood contrast sensitivity testing helps to find, identify, diagnose and treat many vision problems that are untreatable by adulthood.