Hugs to you and your little man.
I have a friend who's niece is two and she has gone through this or something similar (I'm sorry I'm not sure of the exact medical condition she had but it was cancer)! She has beaten the cancer but had to loose her eye in the process.
You couldn't tell though as her prosthetic eye is a complete color match to her other eye! She is such a trooper and so strong for such a little thing! All her procedures were done at the royal children's in Melbourne.
If you would like contact details please pm me and I can get them for you if you have any questions or just want to talk!