A Google user
This is a standard Ishihara color plate test. It is effective in detecting red-green shifts and deficiencies. The (rare) blue spectrum shift, less so. It has a helpful description at the bottom of each slide. You may have to Google the diagnostic term, probably so you don't have a book to read at the end of each slide.
12 people found this review helpful
A Google user
We define someone is colorblind after testing with all plates of Ishihara test. If there are all 38 plates, I'll give 5 stars.
18 people found this review helpful