I am very interested to source statistical data for corrective optical
prescriptions as a means to understand what would be a sensible stock
range to satisfy the majority of customers 'off the shelf'.

I intend to open a Mini-Lab with little or preferably no surfacing.
Preferably only edging and fitting (drilling/grooving/polishing)
equipment.

I intend to primarily fit Polycarbonate.

Obviously this will require an enormous investment in blanks, and I am
trying to understand just how wide a range would give me same-day
service for the majority of cases.

Where should I be looking for this data?

Sincerely,

Colin G Langham .T.Eng.