I would like to buy some glasses online - I had my eyes tested recently but the PD is not on the prescription as I think they don't like to give it to you unless you buy your glasses there.
I usually have my old glasses reglazed and just post them (thus I think they can get the PD from my old lenses) but this time I want new frames.
So - does anyone know how exact the PD has to be - as I have measured it on all the apps I can find and they are not the same. A couple of mm different. Does it matter if I take an average of all these? For info my prescription is very low.
Thanks in advance!