Yeah.  What she said.

I've read an analogy on this group several times.  Break an egg into a
pan.  The stuff they call the "white" isn't.  It is transparent.  You
can see right through it.  Just like a normal eye.  Turn on the heat.  
The white soon turns white.  It is totally opaque.  You can't see a
thing through it.  There is nothing you can do to reverse this.  I'm
told that cataract is like this.  It just can't be reversed.  
Furthermore, as Wooly posted it is inside the eye.  More than one layer
deep.  Putting drops on the outside of the eye doesn't seem likely to
fix this problem.

I'm convinced that there will be a non-surgical fix for cataract.  It
isn't here now, but maybe in a few years, maybe in a few thousand years.  
Right now your choices are surgery or keeping your cataract and going
blind.  I made my choice.