normal colour vision in a sentence

• There is simply no way of knowing whether what one person sees is the same as what another person sees, but the question is so tangled in philosophy that it's difficult even to formulate the question, let alone answer it . basically, the question is usually given thus : A light of a specific wavelength will appear blue to all people with normal colour vision.
• Please let me know what you think . ( To me, with normal colour vision, the new image is slightly less pleasing aesthetically, but perfectly easy to understand . ) If you like what I've done, and no-one objects, I'll make the same change to the female map . talk ) 11 : 22, 6 December 2012 ( UTC)
• It's difficult to see normal colour vision in a sentence .