Pseudoisochromatic Plates Ishihara Compatible Color Vision Test: Quickly screens for normal color vision and both congenital and acquired color vision defects. Classifies to type (protan, deutan, and tritan). The only test available that contains both tritan (blue/yellow deficiency) and basic color vision test plates. Provides additional plates (24 plates total) to comply with testing requirements of the military and most other government agencies.