Ishihara: A Color Vision Test with Unlikely Implications for BOJ Interest Rates Ishihara tests are a widely used tool to detect red green color blindness.
At first glance, it may seem like a stretch to connect these two concepts. However, the story behind Ishihara's invention and its purpose is fascinating. What is Ishihara?
In 1917, Japanese ophthalmologist Shinobu Ishihara developed a color vision test as part of his research on red green color blindness.