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As with everything, you pays your money and you takes your chances. As a general rule, I would try and find a bricks and mortar store with an on-sight lab. If you can, find an SMC qualified technician.
An increasing number of multiple Opticians use giant off-premises labs, that process enormous volumes, and are really set up for glazing in house products. The prescriptions are extremely, extremely rarely incorrect but to a trained eye the lens fitment can suffer, especially if the frame is unfamiliar. -
Yo. I is a Optician. It's a decision not to supply; but it is a decision broadly supported by our professional body (who explicitly recognise it as a dispensing measurement, and not part of an eye test) and often adopted as a company policy. If the measurement is on record it should be supplied to you (ideally with a caveat pertaining to it's origin, ie. when it was measured and for what glasses/purposes) but we are not obliged measure on request.
As to the does it change question: No PD doesn't change, but OC does. Pupil Distance being a facial measurement and Optical Centre being the corresponding lens measurement. The general expectation is that the optical centre of the lens sits directly in front of the pupil, and for most dispenses this true. But not all. Identifing when a modification between PD and OC is required/recommended is what you pay me for.
I've been involved in multiple situations where spectacles purchased online have not worked to patient's expectations and resolving such issues can be logistically fraught as culpability can be extremely difficult to ascertain and even if one party is directly at fault, it's normally just the more willing to acquiesce who absorbs the cost of rectifying.
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Lovely thread. Thanks for the kind words on the build @picco and @RabiCycle and of course for the frame and id @DaveYates
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As we're all here, likely one of yours? @Skülly thought probably...
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Very much stolen from @spinnnout.
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Truth is I fell out of love with the project for several reasons; I got ill and couldn't ride anyway, there was an awesome lugged Caflee gravel bike that came up on ebay that I couldn't justify given this project that soured my taste, the seatpost cost about a billion pounds as I needed a donor post, but forgot to buy the rail adapter at the same time so 2xpost, 2x exorbitant haulage, plus (very reasonable labour). The post owes me almost as as the frame.
Oh and I've chipped the paint twice despite hanging in the bedroom.
The flame could be rekindled.
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Thanks for the previous guidance here. Multiple subsequent unsensible decisions made at my end, but I've enjoyed my music room. It turns out everything works better with the human on the floor and facing away from the window (red), and there are still occasions when I'd rather have speakers. So, should I get something tiny like Audioengine a2+ and put them on the table (dark yellow) or wall/shelf mount something larger like Elac debut connex dcb41? (Light yellow). Bike elsewhere.
More than half an eye on future uses/compatibility elsewhere in the house.
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Left it a bit late for pictures. Colour matched the stem, different bars, grips in the post.