Standard Pseudoisochromatic Plates
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A type of PIP devised by Hiroshi Ichikawa in 1978. There are 2 editions, SPP1 & SPP2, plus SPP3, which is just a combination of the other two. They test for blue-yellow & red-green CVD, but they are much less common than the other PIP tests (Ishihara, HRR, etc.).
