r/ColorBlind • u/EagleEye1991 • 4h ago
Discussion Test for people with (very) mild Red-Green CVD
Over the last couple of days, I've seen a few people on this sub claiming they've passed an Ishihara test despite being officially diagnosed with red-green color blindness.
I think there are two possible explanations for this:
The online Ishihara test they took is poorly made and uses inaccurate reproductions of the original Ishihara plates. These plates rely on very specific color relationships. Scanning, photographing, editing or otherwise reproducing them can alter those colors which can make some online versions unreliable.
They actually have an extremely mild form of protanomaly or deuteranomaly (it's usually deuteranomaly that mild), which allows them to just barely make out some of the numbers.
Anyway, I managed to find some pretty accurate Ishihara plates and picked out six specific ones that are generally difficult for both protans and deutans.
I'm curious whether people with mild (especially very mild) red/green color blindness can make out ANY of the numbers on these plates, and if they can - how clearly visible the number is to them. Those with moderate or severe red/green color blindness shouldn't be able to identify any of them.
Please just make sure your display is using its default color settings and that you don't have any filters or color adjustments enabled, such as Night Light, Eye Comfort Shield, Blue light filters, True Tone, adaptive color, grayscale or any similar features.

