syngirl, I don't blame you. I think eye surgery is an unnecessary risk and I probably will never do it again. I did my surgery 10 years ago when Lasik was still new - not really a good idea in hindsight.
Although the surgery improved my vision greatly - it also gave me a slight case of astigmatism as well as reducing my night vision.
But all in all, 10 years of freedom from glasses was a pretty good run.
In the US, I've seen about three optometrist in the last ten years and they all provided what seemed like a pretty thorough exam looking for disease, detached retina, etc. I don't know if that is the practice here or not. Do you need to go to an ophthalmologist in Argentina to get an exam beyond just a prescription?
I found another post that recommends an optometrist and a Lasik office as well: http://baexpats.org/expat-life/4590-laser-eye-surgery.html
Here is the optometrist recommended:
Optometrist: Dr. Baccarelli
Tel: 011 4311 5187