Ishihara test: Difference between revisions

The Ishihara Color Test is a test for red-green color deficiencies. It was named after its designer, Dr. Shinobu Ishihara, a professor at the University of Tokyo, who first published his tests in 1917. ^[1]

The test consists of a number of colored plates, called Ishihara plates, each of which contain a circle of dots appearing randomized in color and size. Within the pattern are dots which form a number visible to those with normal color vision and invisible, or difficult to see, for those with a red-green color vision defect. The full test consists of 38 plates, but the existence of a deficiency is usually clear after a few plates. Testing the first 24 plates gives a more accurate diagnosis of the severity of the color vision defect.

Common plates include a circle of dots in shades of green and light blues with a figure differentiated in shades of brown, or a circle of dots in shades of red, orange and yellow with a figure in shades of green; the first testing for protanopia and the second for deuteranopia.

• 
  Ishihara Plate No. 1 (12)
• 
  Ishihara Plate No. 13 (6)
• 
  Ishihara Plate No. 19 (2)
• 
  Ishihara Plate No. 23 (42)

• Color blindness

• Ishihara color test information
• The Ishihara Color Blindness Test
• Test of color blindness with the indication of the weaknesses in various colours, quantifies green red blue deficiency ( ISHIHARA test alternative)
• Flash animated Ishihara color blindness test