This is a little late but here is an update. I visited my Optometrist and had a check up, there was really no change in my eyes, I had previously discussed my problem and had been invited to take a rifle along, at that time I was still waiting for the Vaughan .470 so I took my 9.3 Franz Sodia along.

The end result was that we increased the regular part of my lens in my left eye (I am left handed and shoot with my right eye shut) by .5 I have progressive bi-focals and I am short sighted. The end result was that my rear sight is better defined with no loss of my long-range vision.

I have just returned from Africa and harvested three trophies, an Impala, Waterbuck and Zebra in 5 days my first rd shot placement for all three was perfect, I was extremely pleased with the new lens.