It is actually quite scary you are studying to be any type of doctor at all......
But anyhow.... in order to have a proper debate about any subject it is best to do proper research on your topic so as not to look like a complete and utter asshat (which BTW you look like right now)......note that for future discussions, may come in handy.
Now, I understand you are a vegetarian and want no animals being used for food whatsoever - congratulations! give yourself a really big pat on the back! well done! No one here gives a flying feck..... we all have different views and the way you are trying to get yours across is not going to change anyone's mind here... so talk crazy someplace else, we are all stocked up here.
And if you are so worried about animals suffering - why not look a bit closer to home in the profession you will be entering - they are torturing animals for your benefit...to further optometry.... does that not bother you? do you not take issue with chimpanzees going blind from very painful procedures just to further your future career?