DC....just to confuse you more, I have Costas in standard grey and love them. The optometrist I got them from was very knowledgeable and said that "color of the lenses are personal preference...the key factor is getting either wrap arounds or shielded sides ....because regardless of color, back and side lighting is what negatively influences the polarization effect and causes glare".
I have a heavy prescription as well....but if you got to someone who hand machine cuts the lenses as opposed to computerized cutting...there will be no distortion. I don't ...and I have 20/300 vision without glasses.
I went for eye protection re color, side and back light and the wrap around style also cuts the drying effect on eyes by the wind.