Ishihara Colour Vision Test Book for Color Deficiency 24 Plates with User Manual auspowers_batchfour LIONMAX 1'' × 3/4'' Hose

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Ishihara Colour Vision Test Book for Color Deficiency 24 Plates with User Manual auspowers_batchfour LIONMAX 1'' × 3/4'' HoseIshihara Colour Vision Test Book for Color Deficiency 24 Plates with User Manual The test consists of a number of colored plates, called Ishihara test plates, each of which contains a circle of dots appearing randomized in color and size. Within the pattern are dots which form a number or shape clearly visible to those with normal color vision, and invisible, or difficult to see, to those with a red green color vision defect, or the other way around.