In most occupational settings, missing 4 or more of the first 12 plates (excluding the demo plate) indicates a significant color vision deficiency.
The Ishihara 14-plate test is a concise, highly efficient version of the classic Ishihara Color Blindness Test ishihara 14 plate test pdf
Must be conducted under natural daylight or a "daylight" bulb (6000–7000 K). Standard yellow incandescent bulbs can cause false passes. Subjects should identify the number within per plate. The plates should be held approximately 75 cm (30 inches) from the eyes, at a right angle to the line of vision. In most occupational settings, missing 4 or more
: Identifying 10 or more plates correctly is generally considered a passing score. In most occupational settings