So I now need a new glasses prescription. I have been using varifocals for years & they don't (because my eyes are so used to what they are supposed to do) effect my photography or focussing & exposure. I'm now considering going to light sensitive (Reactolite) lenses. Will they (a large part of me expects they will) make a difference to how I not only see a shot, but also to what I envisage are the correct exposure setting? Further, is there a recommended colour for the sunglasses bit of my new specs - one local optician offers a choice of grey, brown, or green. Thanks for any advice.