Discussion
The Ishihara test screens for colour vision deficiency using
Answer: D
Correct answer: pseudoisochromatic plates of coloured dots
The Ishihara plates present a figure in dots that differ from the background in hue but not in lightness or size, so it can only be seen by using colour. Confusion colours are chosen so that a deficient observer sees a different figure or none. It is a fast screening test and identifies the type only broadly.
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