Mark, thanks so much:

- ever heard that contact lenses per se can in our case be bad for our vision (mor work for the brain...)

- when you say photochromic lenses you mean glasses right? so you put them on top of your glasses?

- for me prism is only needed for near sight, I don't seem to tolerate well at long distance. So I have to change glasses very often. That and the sunglasses I need to wear from time to time get too much. I was thinking:

get the regular eyesight correction, and then get glasses that correct prism when work with near objects, and not have to bother to get correction sunglasses everytime I break em (which is often).