Originally Posted by llcj
I'm curious myself. It's entirely possible that I have misremembered the whole thing and it is something hypothetical, such as the tetrachromacy as mentioned by meeera above. It's also possible that it was something I read in a newspaper however I am generally skeptical when reading science news in newspapers (even reputable ones) as the articles are usually so truncated and superficial that they are close to being untrue.
Tetrachromacy makes sense in this case, as the blotches intensify in low light. Funny that the article mentions the need to test individuals and confirm the percentage of tetrachromats - Amazon could just donate their defective Paperwhites to Research - one look and you'd know if you have it or not
This subject is getting more and more intriguing!!