it has also happend to 1 of my black moors. i got distracted while syphoning water and accidently sucked an eye out of his head. was healed within a week and all is good....a lesson learned.
I find it amazing when some fish lose an eye, they survive.
When I first started my community tank, I had a bunch of mollies, roughly 20 to 27, about six of them lost an eye each. Didn't have one last over two months with one eye.
Now, I actually have a little male bronze cory, who is almost three and has had only one eye for well over two years. He is one of the smallest fish in there too. Tough little fellow he is.
One of my black phantoms I got with a missing eye (didn't notice till we got home). That led to the names of my first four: Winkin, Blinkin, Nod and Richard. Guess which one Winkin was? We shortened it to Winky-- she's definitely the smallest of the crew, but man what a little fighter. I love watching her and all of the adjustments she has made to function as well as she can (and she does very well). She swims at a slant, depending on if she wants to look up or down... and you can always tell when my angel is chasing her as he adopts the same slant!
I never had a fish lose an eye. My black moor did get a circle of scales sucked off. I was doing a water change with out the gravel thing on the the end. The other fish swam by just fine. The moor decided to turn around and rub his body against the tube. I have a picture somewhere on one of the desktops. I'm surprised he hasn't lost an eye yet. He is so issued. He randomly tries to get things to lay eggs. Other fish, the easer island head statue, plants. One time I walked past the tank and he had tangled himself in the flowers. He was just wrapped in there with his breeding tubercles out. I did get him at wall mart though.
My zebra danios and glofish are prone to missing eyes. Looks weird, but they're totally healthy. Sometimes they are so fast and aggressive when chasing each other to mate....but I doubt that's the reason - ha!