Comments on: Euro Coins—A Simple Color Blindness Test

By: My Color-blindness test result: strong Deuteranopia « worksofhands´embroideries and other needlework

Sun, 02 Aug 2009 19:04:23 +0000

[...] Euro coins test — I did not even know the coins come in 2 colors!!! copper-covered steel (reddish tones) and [...]

By: Emmanuel

Emmanuel — Mon, 08 Jun 2009 02:47:26 +0000

I don’t see any difference between the second and third pair of coins. Should I?

By: David

David — Sun, 11 Jan 2009 13:12:39 +0000

Protanopia and deutoranopia are sex recessive traits linked to the X chromosome and cannot happen at the same time on men. Women can have X (normal), Xr (protanopia) and Xg (deuteranopia), so the following combinations could happen XX (normal), XrX and XgX (normal vision but carrier), XrXr and XgXg (protanopia or deuteranopia vision) and finally XrXg (tetranopia) which is under investigation ^^.

Tritanopia (blue-green colorblindeness) is not linked with the X chromosome and happens in very rare cases. In even rarer cases it can appear in combination with protanopia and deutoranopia.

That may change your confusion lines.

My parents are from a region where mild tritanopia is common and as result it seems that I have both mild blue-green blindness and strong deuteranomaly.

By: Daniel Flück

Daniel Flück — Tue, 02 Dec 2008 21:37:12 +0000

Hi everybody, there are only three different main types of color blindness: protanopia, deuteranopia and tritanopia; which can be from weak to very strong. To learn more details about this types and the colors of confusion, read more about the confusion lines. And to check your type of color vision deficiency see this color blindness test.

By: Karen

Karen — Mon, 01 Dec 2008 06:56:42 +0000

Susan, your comment is interesting because I didn’t know there was a “violet-blind” name for any of the types of color blindness. I apparently have trouble seeing violets, sometimes see certain greens as blues. I learned this only a while back when I got into an argument about a dress color…. :)