Ishihara colour test 24 tables
Book with 24 plates. A high degree of sensitivity and specificity is required for testing for color blindness. This series of plates is intended to detect color blindness in people who cannot read, and color blindness, from an early age.
Plates are designed with simple geometric shapes, because the examinees may not be able to understand complex pieces.
The test provides a quick and accurate assessment of color vision deficiency of congenital origin.
Most cases are diagnosed with red-green deficiency, which can be of two types:
- protan, which can be absolute (protanapia) or partial (protanomaly)
- deutan, which can be absolute (deuteranopia) or partial (deuteranomaly)
No. 1. Both normal and those with all kinds of color blindness deficiencies read it as 12.
No. 2, 3. The normal ones read them as 8 (no. 2) and 29 (no. 3). Those with red-green deficiencies
read them as 3 (no. 2) and 70 (no. 3). Those with total color blindness cannot read any numbers.
No. 4-7. The normal ones read them as 5 (no. 4), 3 (no. 5), 15 (no. 6) and 74 (no. 7). Those with
red-green deficiencies read them as 2 (no. 4), 5 (no. 5), 17 (no. 6) and 21 (no. 7). Those
with total color blindness cannot read any numbers.
No. 8, 9. The normal ones read them as 6 (no. 8) and 45 (no. 9). The majority of people with color blindness cannot read them or read them incorrectly.
Nos. 10-13. Normal people read them as 5 (No. 10), 7 (No. 11), 16 (No. 12), and 73 (No. 13). The majority of people with color blindness cannot read them or read them incorrectly.
Nos. 14, 15. The majority of people with red-green deficiencies read them as 5 (No. 14) and
45 (No. 15). The majority of normal people and people with total color blindness cannot read any numbers.
Nos. 16, 17. Normal people read them as 26 (No. 16) and 42 (No. 17). In protanopia and strong protanomalia, only 6 (No. 16) and 2 (No. 17) are read, and in mild protanomalia, both digits on each plate are read, but the 6 (No. 16) and 2 (No. 17) are more distinct than the other digits. In deuteranopia and strong deuteranomaly, only 2 (No. 16) and 4 (No. 17) are read, and in mild deuteranomaly, both digits on each plate are read, but the 2 (No. 16) and 4 (No. 17) are more distinct than the other digits.
No. 18. In tracing the squiggly lines between the two X's, the normal trace is along the purple and red lines. In protanopia and strong protanomalia, only the purple line is traced, and in
the case of mild protanomalia, both lines are traced, but the purple line is easier to follow. In
deutaneropia and strong deutanomalia, only the red line is drawn, and in mild
deutanermalia, both lines are drawn, but the red line is easier to follow.
No. 19. When drawing the squiggly line between the two X's, the majority of those with red-green
deficiencies draw along the line, but the majority of normal and those with total
color blindness cannot follow the line.
No. 20. When drawing the squiggly line between the two X's, the normal draws the blue-green
line, but the majority of those with color vision deficiencies cannot follow the line or
follow a line other than the normal.
No. 21. When tracing the squiggly line between the two X's, the normal traces the orange line, but
the majority of those with color vision deficiencies are unable to trace the line or trace a
different line than the normal.
No. 22. When tracing the squiggly lines between the two X's, the normal traces the line connecting
blue-green and yellow-green, those with red-green deficiencies trace the line connecting
blue-green and purple, and those with total color blindness cannot trace any lines.
No. 23. When tracing the squiggly lines between the two X's, the normal traces the line connecting
purple and orange, those with red-green deficiencies trace the line connecting purple
and blue-green, and those with total color blindness and weakness cannot trace any lines.
No. 24. Both normal people and people with all kinds of color vision problems can follow the squiggly line between the two X's.