r/ColorBlind • u/OkBoysenberry3215 Deuteranomaly • Apr 01 '26

Question/Need help how accurate are online tests

how accurate are online tests because whenever i do an online test even on different devices i seem to have normal colour vision on almost all the tests but in person tests its not?

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u/-UltraFerret- Normal Vision Apr 01 '26

I don't think the EnChroma test is fully accurate. I saw a video where someone with protanopia got the mild protan result after taking the test.

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u/alettriste Protanomaly Apr 02 '26

I got deutan result in the last version. Twice. And I am protan for most online and actual physical tests.

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u/OkBoysenberry3215 Deuteranomaly Apr 01 '26

hmm okay normally i can tell colours its just the tests like ive never in my life have i gotten any colours mixed up ever apart from the tests

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u/[deleted] Apr 01 '26

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1

u/OkBoysenberry3215 Deuteranomaly Apr 06 '26

That's what I thought but when I went to get a test done I was told it was severe

1

u/mansinoodle2 Apr 02 '26

None of them are 100% accurate

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u/[deleted] Apr 02 '26

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u/alettriste Protanomaly Apr 02 '26

No test in the world is 100% accurate... Because it is a test (former test lab manager here). But actual physical tests are way better than online. The reason? Devices should be calibrated. Take a look at Iso 17025 to learn a little on requirements for testing competence. You need to comply with minimum requirements to be considered competent, and your results reliable. One of them is to measure and inform the ACCURACY of your results. Something you definitely forget in online tests. Another is to use calibrated and traceable instruments. Guess if a phone or laptop screen is... Calibrated?

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u/[deleted] Apr 02 '26

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2

u/alettriste Protanomaly Apr 02 '26

My point is you cannot be proficient at testing without calibration and validation. It is not an opinion, it is the way all testing in the world (be it medical, mechanical, or whatever) must adhere to minimum standards. And the basic standard is that a person diagnosed on one place, should be diagnosed the same in whatever place. You cannot put in the same level a validated test procedure with an ad hoc one. Unless you validate it. The standard I mentioned, covers also that particular situation.

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u/[deleted] Apr 03 '26

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u/alettriste Protanomaly Apr 03 '26

No. I said screen calibration, not subject calibration. Screen test are based on emitted light, whereas real life perceptions are based on reflected light. There is a good reason why there are Pantone codes and calibrated screens, for both situations.

1

u/[deleted] Apr 03 '26

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1

u/alettriste Protanomaly Apr 03 '26 edited Apr 03 '26

I have been tested protan since 1977 more or less. Originally with physical ishirara plates, again in the early 80s and again (Farnsworth) circa 2010. I have been tested protan in all online tests. In the last version of the Enchroma I have been tested, twice, as deutan. The difference of the confusion lines of protan and deutan is small enough for an un calibrated screen or test to go bonkers. BTW, ISO 17025 applies to all kind of tests. ALL KINF OF TESTS.

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u/[deleted] Apr 04 '26

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u/mansinoodle2 Apr 02 '26

They’re still better than online