I am trying to prepare a training on Selling, fitting, dispensing and troubleshooting progressive lenses. I have found that many Opticians have a different method for measuring the PAL height. See bleow for some of the examples:
Brooks and Boorish, 3rd ed, pg. 455 ...eye level. With wearer looking at the bridge of the fitters nose, fitter draws line through center of pupil. (Paraphrase)
Darly Meister, Progressive Lens Dispensing Module 10, Eye level dot pupil center on demo (paraphrasing)
2020 Optician Handbook -... ask the patient to put on the glasses so they place them where they are comfortable wearing them. Then, with your eyes at the same height as the patients dot the fitting height with a marking pen.
Varilux fitting guide Eye level and draw line through pupil center.
I have seen it suggested that fitter Oclude left eye of patient while fitter closes right eye draw line through pupil center of patients right eye and vice versus. i think I saw this one in an OD training article.
I have witnesed optician telling patient to look in the distance over the fitters shoulder.
There is concensus on all other methods i.e. adjust frame first, correct vertex, panto and face form.
Unfortunatley we don't all agree on where the patient is to look, whether to occlude one eye of patient.
Most of us adopt the; eye level with patient looking straight ahead at our eye. Their left to our right and vice versus. Dotting pupil center. I like the suggestion that the patient place the frame on their face where comfortable and I also like the idea of drawing a horizontal line after center marked and checking that patient see's through this line while standing up.
There are alot of experts on this site and I appreciate your your thoughts on the correct way to measure fitting heights
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