Lens fitting in frame (Spectacles)

I hate(d) the letterbox narrow slot lenses. I prefer the slightly larger lenses, but frameless, only thing is, they tend to be more delicate, and I'm rough on glasses, so I might get a couple of months use out of a pair. Luckily - I manage just fine, with the poundshop ones, even the opticians, agree they are fine for my need. If I spot a pair I like, I tend to buy a few pairs, as they are so cheap.

Theo <theom+ snipped-for-privacy@chiark.greenend.org.uk> wrote in news:c+f* snipped-for-privacy@news.chiark.greenend.org.uk:

Simplest and least prone to error I have found is to have someone take a full face pic of your face with a mm ruler just above your pupils and work out the PD from the image on a PC screen. Best from a decent distance, say 3-4m, (parallax avoidance) on a camera with an optical zoom to get close-in.

Quite possible for anyone who has had a broken nose set slightly off but unlikely to be a great effect in the greater scheme.

Place a ruler across your eyebrows and take a selfie on a smart phone.

I always measure from the centre to my good eye. Then double it!

I've tried to get mine by taking a selfie, holding a ruler to my forehead and trying to stare into the distance and am getting 63mm. I can't find any prescription that confirms this.

I wonder if a 1mm error either way will make much difference on a distance prescription.

I (the OP) am in the process of ordering from

No doubt they will try and upsell or need to add extra as I need prism correction as well as cylinder (astigmatism).

I don't think so - the opening of the iris is going to be bigger than that, so the focus of the lens being slightly off centre is probably not going to make a huge difference.

Good spot, I've requested a submission pack.

For a tenner after discount for basic lenses including three way postage I can't see them making any profit at all. But that's probably a loss leader

- the fancier lenses go up in price quite a bit.

Theo