Jury still out.
Type: Posts; User: Barry Santini; Keyword(s):
Jury still out.
Everyone should read The Varilux Epic of of respect.
it’s available used on Amazon and as a pay-for PDF:
...
Because some shapes—aviators to name one—have something my Dad called “automatic decentration”—meaning the minimum blank size needed to just cut out included extra decentration from the mechanical...
Datum system, which was well suited for the then current 1930s symmetrical, non-gendered lens shapes and frame styles that predominated before the rise of asymmetrical female/harlequine and aviator...
What does it matter?
Harm? No.
”Digital Eyestrain” as it’s colloquially defined? No.
Increased perception of wearer comfort? Absolutely yes!
Be careful what you pronounce with authority. Or...
The central problem with most acetate frame bevel grooves is that the frame front is milled flat.
Then frame wrap is introduced, effectively moving the frame’s rear bevel groove shoulder further...
tell use more
Fea
In a counter intuitive way, often with poor cosmetics—You coukd move the bevel apex extremely forward: This will often help avoid the splay.
barry
Look no further than TC Charton
B
In the absence of coordinated, national optician licensure, the path forward is clear:
1. Recognize the best/most important parts of legacy opticianry teaching
2. Recognize the areas, such as...
Yes, Certainly YMMV.
B
As if the 15-17% overall remake is actually manageable or avoidable within today’s optical landscape.
Respectfully, I see this as naive.
B
Because they’re bad of terrible quality materials. That’s why.
B
There’s nothing “right” about it according to Wollaston or Ostwalt.
B
Sounds goods. But I implied nothing about wearer comfort. Just accuracy of positioning
B
If high accuracy is the goal, you’d never use a PD taken objectively with a ruler or via corneal reflection
B
But if they look in any direction except straight ahead, the consequences apply.
Now what?
Just what is so wrong with using a binocular PD?
The older datum system was a more effective guide when fitting a frame.
the boxing system was a lab answer to non symmetrical shapes in the age of limited blank diameters .
You must always balance Martin’s Rule against the impact of abbe when the panto is 8 degrees or more.
B
If all opticals/docs were inherently ethical, there wouldn’t be any laws.
B
Yes. But I dont make the rules or determined the DMV acuity screening thresholds. Many drivers see 20/40 and worse.
But having no consequential data to crunch relating vision to accidents or even...
I’m all with you on working together with ODs.
just follow the law and tender them a copy of their Rx after the exam is done—not just upon request.
That’s my essential “must have.”
Last time I checked, almost the entire world’s motor vehicle screening standards center on 20/40 acuity, which a +0.50 hit rarely surpasses.
B