I have yet to run a Vision Ease lens without a load of hassle.
I cant sag them with the clock as they are aspheric, the sag they provide throws up power problems. The people on the phone at VE here in the UK are little help.
Thus far I have run all their lenses too thick (so I can rework them) with a known back surface, calculated the front surface after foci then calculated a sag, which I use for future orders.
I am informed the sags are compensated for 1.53 index, this seems daft to me as a sag is a measurement of distance.
So can somebody confirm the above, and if so remind me of the formula to convert..