| Test Name | Plates/Format | Legality | Best For | |-----------|---------------|----------|----------| | | 24 plates (outdated version may be free) | Some versions public domain | Differentiating types | | Farnsworth D-15 | Arrangement of colored caps | Open source instructions | Vocational screening | | Color Vision Test App (CVT) | Digital plates | Free on app stores | Quick self-check | | Cambridge Colour Test | Computerized | Free research version | Scientific studies |
The is the gold standard for screening red-green color vision deficiencies. First published in 1917 by Dr. Shinobu Ishihara, this test remains the most widely used tool by optometrists and ophthalmologists worldwide to identify congenital color blindness.
Before diving into the download process, it’s important to understand why the 38-plate version is so highly regarded.