Y did the optician show me red and green rectangles w circles and asked me which rect looks sharper? purpose?
Answers:
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This has nought to do with colour delusion testing.
Red and green enjoy different wavelengths and do not focus on the retina at the back of your eye at equal time.
It tells us whether you are focussing or whether your eyes are relaxed.
This exam works even when people are colour not up to scratch (colour blind) and cannot see the colour of the background.
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To see if you are colored blind. Those that are can not see red or green.Might have to do next to discerning colors, - some people don't see some colors as different. Might own to do with discerning that you use both eyes together.