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Ishihara's Color Blindness Test
 
These series of images are designed to provide a test which gives a quick and accurate assessment of color vision deficiency of congenital origin. This is the commonest form of color vision disturbances.
 
Image 1
Both the normal and those with all sort of color vision deficiencies read it as 12
 
Image 2
 The normal read this as 8. Those with red-green deficiencies read this as 3. Those with total color blindness cannot read any numeral.
 
 
Image 3
The normal read this as 29. Those with red-green deficiencies read this as 70. Those with total color blindness cannot read any numeral.  
 
Image 4
The normal read this as 5. Those with red-green deficiencies read this as 3. Those with total color blindness cannot read any numeral. 
 
Image 5
The normal read this as 3. Those with red-green deficiencies read this as 5. Those with total color blindness cannot read any numeral. 
 
Image 6
 The normal read this as 15. Those with red-green deficiencies read this as 17. Those with total color blindness cannot read any numeral. 
 
Image 7
The normal read this as 74. Those with red-green deficiencies read this as 21. Those with total color blindness cannot read any numeral.  
 
Image 8
The normal read this as 6. The majority of those with color vision deficiencies can not read them or read them incorrectly.
 
Image 9
The normal read this as 45. The majority of those with color vision deficiencies can not read them or read them incorrectly. 
 
Image 10
 The normal read this as 5. The majority of those with color vision deficiencies can not read them or read them incorrectly.
 
Image 11
The normal read this as 7. The majority of those with color vision deficiencies can not read them or read them incorrectly. 
 
Image 12
 The normal read this as 16. The majority of those with color vision deficiencies can not read them or read them incorrectly.
 
Image 13
The normal read this as 73. The majority of those with color vision deficiencies can not read them or read them incorrectly. 
 
Image 14
The majority of those with red-green deficiencies read this as 5. The majority of the normal and those with total color blindness cannot read any numeral.
 
Image 15
 The majority of those with red-green deficiencies read this as 45. The majority of the normal and those with total color blindness cannot read any numeral.
 
Image 16
The normal read this as 26. In Protanopia and strong Protanomalia only 6 is read, and in cases of mild Protanomalia the numeral is read, but the 6 is clearer than the 2. In Deuteranopia and strong Deuteranomalia only the 2 is read, and in the case of mild Deuteranomalia both numerals are read but the 2 is clearer than the 6.
 
Image 17
The normal read this as 42. In Protanopia and strong Protanomalia only 2is read, and in cases of mild Protanomalia the numeral is read, but the 2 is clearer than the 4. In Deuteranopia and strong Deuteranomalia only the 4 is read, and in the case of mild Deuteranomalia both numerals are read but the 4 is clearer than the 2
 
Image 18
 In tracing the winding lines between the two X's, the normal trace 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 Deuteranopia and strong Deuteranomalia only the Red line is traced, and in the case of mild Deuteranomalia both lines are traced but the Red line is easier to follow.
 
Image 19
 In tracing the winding line between the two X's, the majority of those with red-green deficiencies trace along the line, but the majority of the normal and those with total color blindness are unable to follow the line.
 
Image 20
 In tracing the winding line between the two X's, the normal trace the bluish-green line, but the majority of those with color vision deficiencies are unable to follow the line or follow a line different from the normal one.
 
Image 21
 In tracing the winding line between the two X's, the normal trace the orange line, but the majority of of those with color vision deficiencies are unable to follow the line or follow a line different from the normal one.
 
Image 22
 In tracing the winding line between the two X's, the normal trace the line connecting the bluish-green and the yellowish-green, those with red-green deficiencies trace the line connecting the bluish-green and purple, and those with total color blindness cannot trace any line.
 
Image 23
In tracing the winding line between the two X's, the normal trace the line connecting the purple and orange, those with red-green deficiencies trace the line connecting the purple and bluish-green, and those with total color blindness and weakness cannot trace any line.
 
Image 24
 Both the normal and those with all sort of color vision deficiencies can trace the winding line between the two X's.
 
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Last modified: September 17, 2010

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