Well, it looks like I was wrong. Previously, it was thought that humans were the only mammal to have a white schlera. But apparently, the original study only looked at 4 gorillas and assumed that whatever these 4 gorillas had, must be representative of all gorillas (ie. bad science; way too small a test group).
So, although rather rare, some gorillas do have white schleras............
BTW, I didn't make my original statement based on looking at online pictures (I know that what we see online isn't necessarily real); I based it on what I had learnt over the years; scientifically speaking.
Many in the arts think of science as being the "opposite" of art; personally, I think of both as being complementary............. Anyway, this is getting a bit off topic.
Just in case you're interested, check this out:
There is something weird about this gorilla's eyes