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My optician is on vacay, and I'm the replacement optician.
I boo-boo-ed.
I sent a lens only order to a lab who doesn't have the patient's frame pattern. It's a VCP job so I don't want to cancel, re-submit, blah blah.
I want to send a pattern, preferably electronically.
Anyone know how that works?
Now I need a vacation.
Do you trace in house - and is that tracer set up to transmit to the specific lab in question - and have they checked the calibration for accuracy anytime in the last say 12 months or so?
If so, it may be as simple as sending a "dummy" order with Joe Schmoe as the pt name or some such thing, trace the frame, and fire it on over. Then just a quick call to the lab to let them know what's happening, and they should then be able to attach that trace file to your pt's real order already in process.
If you edge in house just call the lab and give them the frame measurements and ask for uncuts and edge it yourself.
Frame measurements will get you a blank that works. But it's certainly not as good as a tracing, especially in plus powers.Quote:
Originally Posted by NAICITPO
It depends what job you have to do.Quote:
Originally Posted by Kwill212
We are optician. No fear.
single vision? It is ok for minus lens, for strong plus you have to choose only small blank.. ok, if you want a better lens is better with tracing and precal by lab but I charge it to the client the service.
Many lenses are simply stock lenses... we can cut it like the lab
edger with 3d bevel help much
I'm newer to working in the lab, so forgive my ignorance but is there any optic quality difference in the lens or is it just the risk it won't cut out?Quote:
Originally Posted by Kwill212
I've only had a couple jobs not cut out in a year and a half of edging lenses when I gave the lab the frame measurements. Usually it was weird shaped frame with a larger ED than standard (A +3, I know this is an approximate).
With some of the most advanced lenses the shape does affect the optics. Or I should say the optics are optimised to the shape.
Quote:
Originally Posted by dima
I think it's pretty obvious that Drk isn't talking about a stock lens, because what in the world would you need a tracing for when using a stock lens?
Derpity derp, I found a frame on the board and sent it as a sizer.
I'm stupid and idiotic.
But you guys are great.
I'd better stick to tonometry.
If you have a minus lens have no fear. But corners matter in plus lenses. You did the right thing Doc. Trying very hard to avoid the wrath of Kwill.
So basically digital lenses?Quote:
Originally Posted by Robert_S
I think we should be asking the frame companies to provide accurate c=size/bevel (best case 400-point file) info on their web sites (for free). Perhaps if we all asked our frame reps on each call, we might initiate an industry change. I know ‘Frames’ sells this info, but I’d be leery to edge to it.
As an industry we would need to develop a device that is accurate, affordable, and repeatable in measuring c-sizes.
C-size tapes have an inherent error as the only measure in the X and Y plane leaving errors as to the unmeasured Z Axis. They also have their measurements on the outside of the tape and the tapes are .3mm thick so they must be graduated to compensate for this.
Combined with differences from multiple vendors, Lenses only have always been a turkey shoot. My experience at best was 96% “good” fit. That leaves 4% failure. A hard pill to swallow for a patient that drove in from out of town. Also, user technique contributes to errors.
Square Circle 50 50 2l*2h pi * r2 200mm 157.0795 Error at .3mm thick tapes on shapes 1.2mm 0.94mm
Some stylus tracers also do not take this Z axis into account.
Again, I have been retired for several years now so maybe you all got this his figured out.
Chris
Erm... No.Quote:
Originally Posted by NAICITPO
This is my experience managing a lab doing 1800 orders a day. We supplied 85% of the frames for our orders and did not trace anything except the first time we processed the frame. This is what I found. We added a compensation to our software that adjusted the c size according to the base curve of the lens. We saved the first pair of lenses that we made as a standard for that frame. We ran a test consisting of three random frames every 6 hours to validate the sizing of the edgers. The only problem we encountered was inconsistent sizing of frames from batch to batch. When we had a no fit we went back to our first pair of lenses and they never fit in the frame. This required an adjustment to c size which would last for an undetermined amount of time until the problem arose again.
Ok, what did you mean when you said advanced lenses?Quote:
Originally Posted by Robert_S
Dude, these are companies that can't provide accurate A, B, and DBL measurements. I don't trust a measurement that I didn't take.Quote:
Originally Posted by ChrisBowers
I couldn't agree more.Quote:
Originally Posted by AngeHamm
Not to mention the sometimes wild swings in sizing from one production run to the next. Assuming a company-provided C measurement is accurate is just asking for breakages.
+1
Quote:
Originally Posted by AngeHamm