The HRR Pseudoisochromatic Plates 4th Edition employ a sophisticated test strategy that virtually eliminates the potential for memorization and malingering. The figures used by the plates are independent of language and suitable for both adults and children. The HRR Pseudoisochromatic Plates has achieved worldwide acceptance with instructions for the test administrator available in 24 different languages. Extensive clinical trials employing almost 100 normals and 125 color defectives testify to HRR efficacy.
Supports the most efficient color deficiency screening. Six plates (screening series) present the most difficult yellow, blue, red, and green colors and separate Normals from Defectives. Subsequent 14 plates diagnose as to the extent (mild, medium or strong) and type of defect (protan, deutan, tritan).
Comes with a brush which should be used by the patient to trace patterns. This is superior to finger tracing, which can fade the color plates over time.