DS is two and a half, and like every kid there are ways in which he's behind his peers and ways in which he's ahead. One way in which he's ahead is colour identification. Colours were some of his first words, and for months he's been able to confidently match colours to names. Both in terms of recognition ("which car is blue?") and identification ("what colour is that?") - he has very high accuracy with most basic colours.
Except red and green. Give him something red and ask what colour it is, he'll say "red" 50% of the time and "green" 50% of the time. Give him something green, same thing. He's always identifies it as a red/green thing, as opposed to any other colour, but seems to be totally incapable of distinguishing between the two. Obviously I can't see through his eyes, but it really feels like he's perceiving them as distinct from everything else, but the same as each other.
People say that this is far too early to try to detect colour blindness, and I get that for most kids that would be true - but for an issue this specific (especially given something like 6% of males have some degree of red-green colour blindness), in a child that's otherwise ahead of their age in this area, is it [i]really[/i]?