Mysteries of Color

Edward Choi

This is your first case. This man was the first person to see him dead, the witness. When the judge asked him what had happened to Mr. Jones and how did he die, the witness answered: I was walking by and I saw this little boy picking flowers from a tree. I could not tell what the flowers were because I am colorblind so I went to ask him. The little boy told me they were oleander leaves. I did not know at the time what these were, but now I have come to realize that they are poisonous flowers. When I saw the little boy give them to Mr. Jones, he fell immediately and that is when I called the police. After narrowing him down as a possible culprit, we did a second test on him. To understand the second test, please click on the link. His results on the second test were:

Photo #	What you see	Correct Ö Correct X Incorrect	Diagnosis
1	12	Ö 12	This shows he is normal, everybody should be able to see this one, even color deficient people.
2	3	X 8	When you see a 3 it means you are red-green deficient.
9	81	X 74	When Red-Green deficient you could see 21, so this shows he is Red-Green deficient.
12	nothing	X 97	This shows a Red-Green deficiency.
17	nothing	X 73	This shows a Red-Green deficiency.
21	31	X nothing	This does not give any direct indication of anything.
23	42	Ö 42	Correct
24	33	X 35	This shows a deutan colorblindness.
27	traced red line		There were two lines to trace and he traced the red one showing deutan colorblindness.
29	nothing		Shows a red-green colorblindness because he cannot see anything.
31	nothing		Shows a red-green colorblindness because he cannot see anything.
32	nothing		Shows a red-green colorblindness because he cannot see anything.
35	trace off line		Traced off the line showing a red-green colorblindness.
37	nothing		Shows a red-green colorblindness because he cannot see anything.
38	traced correctly		Correct

From these results, we have classified case 1 as deutan deficient. This means he is 'green weak'.

The next test we did on him was test 3, please click on the link so you understand what test 3 was.

Case 1 made the first drawing correct the the second drawing had some errors. He thought the ending of the yellow-orange pattern was yellow, but if you looked at the diagram in test 3, it is supposed to be orange. He was told carefully that the beginnings and ends must match the diagram but the number of strips did not matter. This proves it was not a careless error. Also, the ending of the yellow and green pattern ends in red. The arrow shows that this is supposed to be green, but because it was next to the purple this case could not differentiate the difference between green and red. The final problem is that he switched the green and red pattern because it was supposed to end in red. All these were great indications that the case was a strong deutan colorblindness.

The last part of the case testing was test 4. Please read test 4 to understand the final process.

Red Filter: (only correct answers displayed)

	Left	Right
Top	25	29
Middle	45	56
Bottom	6	8

Green Filter: (only correct answers displayed)

Left

Right

Top

25

Middle

Bottom