How do you properly/precisely check the base curve on a FT bifocal, progressive or aspheric lens using a lens clock. I have gotten mixed reviews and want to be accurate in my technique and results.

I have found that on a FT lens, I read with the pins horizontal just above the seg line.

On a progressive lens I have taken the higher of the vertical and horizontal measurements I have gotten. I use the same method for aspheric lenses.

Your insight is much appreciated.