On Thursday, February 25, 2021 at 10:58:56 AM UTC, Bob Eager wrote:
On Thu, 25 Feb 2021 00:47:21 -0800, jkn wrote:

I have got SWMBO to do that. In fact I measure from mid nose to the
centre of my right eye, then double it. That's more accurate - for me.

Huh?

I measure my PD myself as well. But how is that method more accurate
than measuring the actual PD in full?
I said - for me.

I know - I was curious about the clarification

My left eye is missing. I'm only concerned about the position of the
right lens.

Fair enough. It didn't seem likely that your nose was *by definition*
half-way between. I didn't think laterally enough, thanks.