Last year my doctor told me I had level one cataracts in both eyes. That seems to be on a scale of one to four.
This last Friday I looked in the mirror and my outer rims of my irises, which have been a rich brown my whole life, are distinctly blue-grey for almost a third of the way in.
I'm rather surprised I'm only just noticing.
I guess that shows how much time I spend NOT looking in the mirror.