Juvenile cataracts are associated with the merle gene — the same gene responsible for the dappled appearance and blue irises of some Aussies. (dogcare.dailypuppy.com)
Why are my wife's corneas transparent but her big blue irises are not? (discovermagazine.com)
Like many people with light blue irises, my eyes are super sensitive so even the smallest amount of light keeps me up / wakes me up. (feedspot.com)