me too, and I found it did get harder, but easier at the same time. I know that doesn't make sense, but logically I could see the colours, so practice made it easier, but I found my vision getting a bit blurred by the end, so that made it harder.

I ended up with a 7, blue/green being my worst area

18 - not too bad. A little off in the blue/greens. Having been a photographer/color printer for 35 years, I would hope that I could still see color. (The sky IS purple, right?)

I took it again and got 43 (v. 8 before). hmm.

I suspect 1) either tired eyes and a different monitor; and/or 2) a completely bogus test and scoring result.

yeah perfect

4

I aced it :D

I suspect color adjustment of your monitor, ambient lighting/ surface reflection on your monitor, attention and fatigue would all affect the result.

I beleive the eye gets tired of staring at similar colors and would become less sensitive the harder you try, go and do one of the other strips and come back.

Once I thought I was done I tried blinking rapdily and looking away and back again rapidly (flick gazing) to see if any popped up as out of place, I got one or two this way.

If I was unsure about a tile, I'd just drag it one spot over. If it didn't belong in that new spot, it would really jump out at me. So I would drag it back.

I just keep reading about all the tricks you are using...

I tried again...

I just can't make myself do it. I almost want to know how bad I'd do... but then I lose interest a few clicks in.

It helps if you are having a boring day at work...

I think the new challenge should be, you have to sort all of them in under 60 seconds.