Vitamin C eye drops

 Hi

I'm a pharmacy student, and has gotten a task of doing a presentation about vitamin C eye drops. After some internet searching, I've found that the use of it is for glaucoma, but finding any other information is not too easy. It has been helpfull looking a little around here, though.

What I want to ask is if anyone can give me examples of actual eye drops containing vitamin C? We are supposed to "make" these ourselves, but also compare our "product" to existing products on the market. I think maybe you here on this web page are the best resource I might find.