Do you have a budget or is this a way of soliciting equipment donations?
Portable is relative; most operating microscopes are anything but portable. There are some lightweight designs, but they achieve that by less stability, less adjustability (electric servo controls) and a more basic illumination system.
I have heard of situations where a traveling surgeon carried a microscope head between facilities but where a common stand type was available at all the facilities where he worked. That is not truly portable, but the right idea.
What kind of eye surgery do you plan for this portable microscope to be used for? If it is for extracap, by trisection or hook techniques, many surgeons can do those cases with high-power surgical telescopes. But you need good lighting, even with that.
What are your other capabilities? Do you have a phaco unit, implants, sterile instruments and consumable irrigants and injectables?
The most portable state-of-the-art phaco unit I have seen is the Oertli machine, made in Switzerland. It isn't available in the U.S. market (go figure--FDA) but it is available in Canada and just about everywhere else. Very nice and compact, and even comes with a plasma cutter for capsulotomies and can hang on an IV-type pole.
