What no one has mentioned is that an optician will measure the
spacing of your pupils and use that in setting up the
lenses/frames so your eyes function correctly.
Ok, so you can bend optical wire around a lens and solder it.
Doesn't mean you really know what you're doing.
True. There’s scope for messing it up. But there are some things we
can do to get it right. Especially if the lenses are in their
original frame (properly dispensed). And assuming also the Rx still
My first optical frame I made was a way to get experience. I used
existing Rx lenses in their frame. I carefully noted the Distance
Between Lens measurement (DBL), optical centres, retained the
rotational alignment of each lens by drawing a horizontal line over
each, and marked each lens L and R. All before removing the lenses
from the old frame.
The optical centre (OC) of each lens must be right over each pupil,
as you say, Neil. And we can gauge with some accuracy where the OC is
by feeling for the thinnest part of the lens (for a short-sighted Rx)
or the thickest part (long-sighted Rx).
But definitely the best way to go is to make a frame that you want
to wear with lens-holding mechanism that the optical trade
understands, and fit it with non-Rx lenses. You can buy these 'plano’
blanks. Take the frame into your dispensing optician so they do their
stuff to cut the new Rx lens blanks to suit your frame. They have
gear that follows the eyewire and builds up a 3D computer trace, and
another machine grinds and cuts the lens to fit right into your new
Do not test yourself for glaucoma!
I’d further advise people to see an ophthalmologist for eye-health
checks, as they are trained in that. Optometrists are trained mainly
to measure eyes, with a bit of health tests thrown in. My optometrist
missed diagnosing a detached retina.