I picked up a patient from doctor's lane last night and he told her that we do 18 different measurements for a persons glasses order.
Okay, I was blindsided and I will totally admit I do not know what 18 measurements those would be.
Anyone? How many are there when you are picking out glasses with a patient?
Lets see if those online pin heads can match that! All they want is a stinking PD and seg height!
A, B, ED, DBL, temple length. There's 5.
Far and near monocular PD, 4 more.
Seg height, OC height, 2 more.
There's 11.
Vertex measurement, 1 more.
There's 12 for you, any more anyone?
Panto and wrap, preferred reading distance. That's all I've got.
Pshaw- I bet we can come up with way more!
I'll try-
Frame
1. lens size
2. bridge size ( you could break this out to several imo)
3. temple length
4. wrap
5&6 vertex (each eye)
7 panto
Face
8,9,10,11 PD (dist. near each eye)
12&13 pupil size
14&15 OC height (or whatever Barry wants to call it) (each eye)
Lens
16 17 18 19 Base curve (convex + concave)
How high can we go?!
Per Mike A B and ED + seg height (each eye). That's 23 if you break out my Frame lens size and add seg height.
Per Judy Focal lengths 24...
Last edited by Uncle Fester; 11-05-2014 at 12:04 PM. Reason: tweak...
Will there be enough time in the day for Robert M. to chime in???
How many steps in verification?
Last edited by Uncle Fester; 11-05-2014 at 12:06 PM.
If you're selling a silhouette, you can specify regular hinge vs high power (for thicker lenses) hinge. It's not really a measurement...Does that count?
Are we counting the measurements the Dr. takes to get the prescription for the glasses order? Does trial framing the patient count? Was it at a lenscrafters? Do they still have that head measuring thing (Accufit?)?
Preferred reading distance and reading angle. Computer monitor distance and angle.
Florescent light brightness in work office to determine density of comfort tint?
Cosecant of the the fourth lateral sub sub quadrant of Europa in 2061 as viewed from the 8th binary dimension by HAL?
There are rules. Knowing those are easy. There are exceptions to the rules. Knowing those are easy. Knowing when to use them is slightly less easy. There are exceptions to the exceptions. Knowing those is a little more tricky, and know when to use those is even more so. Our industry is FULL of all of the above.
"Cosecant of the fourth lateral sub sub quadrant of Europa in 2061 as viewed from the 8th binary dimension by HAL?"
Oh yeah, I forgot about that one. Thanks!
All the doc can come up with is 18 measurements. With all the little things that have become inherent it might surprise some that we could easily come up with a minimum of 50. Robert, on the other hand can write an entire book based on required frame and lens measurements.
I didn't attend the funeral, but I sent a nice letter saying I approved of it. Mark Twain
If pan to and face are taken (2) then vertical and horizontal inset per lens are important to compensate lens tilt from frame tilt (4) of course monocular PD for distance and near if the design comps for convergence insufficiencies (4) fitted and refracted vertex distance for power and design compensation (2) frame demensions A, B, ED, DBL (4), that's 16 without touching the lens and they are absolutely necessary and you can see justifiable for a good lens design.
Doctor is a better sales person then all of us combined.
Is the Doc selling or bs-ing?
And that comes with an ethical responsibility that they should never take advantage of.Originally Posted by braheem24
B
The fact that he counted all the possible measurements needed to correctly fit glasses is what makes him a better sales person not his doctorate.
We need to stop cheapening our profession. I pay more for a mechanics opinion.
First and foremost, determine the optimal lens design, position, material, etc., selecting a pre-adjusted frame that can accommodate those requirements. Then, and only then, can we measure the lens position every which way, in a way that can be communicated and replicated by the fabricator.
An accurately measured lens position is worthless unless the lens position and lens design is optimal for the Rx and the individual's needs.
Science is a way of trying not to fool yourself. - Richard P. Feynman
Experience is the hardest teacher. She gives the test before the lesson.
And so we have the final word.
Braheem is spot on as well!!!
What about measuring a person's previous glasses - panto, vd, face form, even the boxing measurements of previous frames....
Isn't this an important consideration? Previous lens design, index, bc...How about their previous glasses Rx?
It is not just about the new glasses, it is about the old as well....
Not sure the onliners have that one figured out.
On the flip side online opticals are providing adequate glasses with
Sphere powers R and L (2)
Cylinder R and L (2)
Axis orientation R and L (2)
PD R and L (some just binocular) (1 - 2)
That being the min 7 - 8, that's just a basic fit without have a client even physically there.
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