This to me looks like the "very small number" refers to the ones where this is visible, not to the amount of them that has somewhere mosaic-style cell patterns.

This to me looks like the "very small number" refers to the ones where this is visible, not to the amount of them that has somewhere mosaic-style cell patterns. For example it is widely known now that if not most women, all women have mosaic patterns on their retina, this not only explains differences in disabilities (like the ocular albinism in the article, but also daltonism), but in perception: While men can see 3 primary colours, women can see 6, it is of course 2 kinds of each other, but still 6, this might explain why women treat colour differently than men (example: women are more interested in the colour of home decoration and clothes, they give more names to colours than men do, they can choose between two very similar nail polish colours when most men don't notice the difference, and so on). Why is that of course veers in the theoretical, the best guess is that while men is better to track motion, probably because they were the primary hunters, women are better in dealing with other types of food (for example colour is important to figure how good to eat vegetables are... there is a reason why farming corporations improve the colour and shape of their fruits, instead of improving the taste). EDIT: someone posted a video elsewhere on the thread about this subject: https://www.youtube.com/watch?v=BD6h-wDj7bw https://www.youtube.com/watch?v=BD6h-wDj7bw