Ishihara Testing Ishihara Testing


"12" Those with all sorts of colour vision deficiencies will be able to read the figure as 12.

 


"8" Those with normal vision will see the figure 8.

"3" Those with red/green colour blindness will see the figure 3.

Nothing - Those with total colour blindness cannot read any numerals

"74" Those with normal colour vision will read the figure 74.

"21" those with red/green colour blindness will read the figure 21.


"6" Those with normal colour vision will the figure 6.

The majority of those with colour vision deficiencies cannot read them, or read them incorrectly.


Nothing - The majority of those with normal colour vision and those with total colour blindness cannot read any numbers.

"5" Those with red/green colour deficiencies will read the figure 5.

Those with normal colour vision can trace the red/purple line.

In Protanopia (red colour blind) only the purple line is traced.

In Deuteranopia (green colour blind) only the red line is traced.

 

Source:  ISHIHARA INSTRUCTIONS - A series of plates designed to test for Color Deficiency.

SHINOBU ISHIHARA M.D., Dr. Med. Sc. Professor Emeritus, University of Tokyo, Japan.

 

Disclaimer: There are many different monitor screens displaying a variety of colours, therefore the accuracy of this test is very limited. For a complete and proper diagnosis you should consult an eye care professional.

 


See also:

What is Colour Blindness?

Anatomy of the Eye

Types of Colour Vision

Causes

Links

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