Thanks for the compliments!
JFetter, I am still just learning about this myself, but so far I have only come across reports of eyes getting brighter and lighter in the raw community, with many people's eyes remaining their same basic colour. Some iridologists (and others) theorize that there are only two basic eye colour categories: 'true brown' and 'true blue', and that many people with brown, green, or hazel appearing eyes are in fact 'true blue' (those who were born with blue eyes that turned darker in childhood, which is quite a common phenomena in persons with some European ancestry). If true, this would probably be the case for most people of European ancestry with hazel or green eyes. Generally speaking, people in mainstream society do not experience significant eye colour shifts in adulthood, and it seems that the ruling scientific establishment believes it to be "impossible"--except darkening, which sometimes occurs as a side effect of using certain pharmaceuticals (generally the opposite effect, with blue eyes turning brown). This darkening effect from introduced toxins seems to support the idea that the brown in some people's eyes could come from toxic build-up rather than be the true natural colour of their eyes. Someone in this forum noted that the age where eye colour darkens in babies is usually around they time that they are weaned off mother's milk and given cooked foods (there is a thread about eye-colour shift elsewhere on the site).
I do not know what it is about the people whose eyes stay blue that causes their eye colour to NOT shift when eating a SAD diet, because I am sure that light eyes are not a fool-proof indicator of overall health. My maternal grandmother has very light blue eyes to this day, but she has struggled with severe obesity since before I was born and is now diabetic with a slurry of complications (cannot even stand up from her chair without assistance). So please use other more reliable indicators to tell you about your overall state of health! I wouldn't want to contribute to the promotion of misleading stereotypes.
Reports like mine are generally from people who started out with brown or hazel eyes, and I have only come across one raw vegan on youtube who makes a claim of a dramatic and rapid shift from entirely brown to almost completely blue. Otherwise, all reports I have seen are of a more subtle change and generally over a longer time period--most are from those who follow a RVAF diet rather than vegan. I guess we are all still experimenting! I have no idea if my eyes will continue to lighten to a definite green or blue, go back to brown, or stay as they are from now on.
If you are starting off with blue eyes and your eyes do change in appearance at all, it is likely that they would shift to a lighter blue. Unless they go light enough to be called 'steel' or 'grey', people won't have a different category to put you in. However, if you stick with eating this way you can expect lots of compliments on your eyes anyway, since it seems to affect the way light is reflected off the eyes (they become glossier all over) whether or not the iris is affected. I have gotten eye compliments since the first few months, but only recently about the different colour.
Hope that helps (and sorry if it's too wordy, I am used to writing essays lol!)