Hereunder three options. These are highly recommended ophthalmologists from my work and from the "Obra Social Luis Pasteur". However, not sure how expensive they are. (I haven't used them)
Jorge Bar 4823-4336/4827-2890 / Carlos L. Nicoli 4816-9100 / Carlos H. Lerner 4811-0003
Here is Nano's website. http://www.clinano.com.ar/ I think he's the most famous eye Dr. in Buenos Aires in pathology and his son does laser surgery etc. I will have to search for his sons website as I don't have it at the moment. I have been to him and he's very good.
I think what Igor is hinting at is comparison of the words Nano and Micro......Nano being to a smaller or minute degree better than Micro. Maybe I haven't explained the pun technically well but I hope you'll understand what Igor is joking about. If you stop and think about it......it is quite amusing!!!