attempt at mimmicking Overview lens

[THE MEB]

I just got word from a freeform lab that they cannot grind this rx,they had it for 2 months, and said they have spent countless hours trying to get layout. They claim the tools won't cut the thickness needed on this job. I asked them to try and mimmick the old essilor Overview, which had a progressive design, with an Ultex on top. I requested an RD45 on top, with a comfort progressive. I have had patient, who happens to be an ENT doc, in an Overview for 20 years, he has babied the last ones from about 10 years ago, which I could only get in an 8BC at the time, but he accepted it, because the lens has worked so well for his job.

His rx is as follows: -2.75 -.75x 90
-3.50 -.75x90 w/ +2.50 add

I have him in full metal round frame in 44 eye to keep thickness down
I requested cr-39 to give him optimum optics, w/AR

I talked w/ owner of lab today, who said he could layout 1.67 w/ different BC to see if it may work, but he is going to out of town for a few days, which means I am holding this 2 month old job at the lab for another week with in my opnion a very slight chance of working.
Subsequently, I am asking if anyone knows of a lab that is willing to try making an Overview type lens for me? I don't care if is freeform technology, even though it is hard to imagine anything else but freeform work. Thanks

[drk]

Just as an exercise, can we think this over?

Question #1: would it be easier to put back-side progressive curves on an upside down round seg blank OR...

...would it be easier to grind a back side round seg on the top of an upside-down traditionally molded progressive?

[HarryChiling]

Hey give me more info and I'll send you a lens, I can't get Comfort blanks, but if you would like I can get GT2, Gradal Top, Natural, Compact, or Ovation. What add would you like on top and how far from fitting cross do you want that seg? Give me more details.......

[HarryChiling]

Just as an exercise, can we think this over?

Question #1: would it be easier to put back-side progressive curves on an upside down round seg blank OR...

...would it be easier to grind a back side round seg on the top of an upside-down traditionally molded progressive?

The problem is that the lab is probably trying to do everything in one shot. I think if they focused on a progressive lens blank with a simple spherocylindrical curve on the back and then made a second pass to put the seg on the back it would be a lot more simple. And I am tempted to prove it.

[Jacqui]

It would not be that hard if you don't mind one seg on the front and one on the back. Should take about 20 extra minutes to do.

[HarryChiling]

It would not be that hard if you don't mind one seg on the front and one on the back. Should take about 20 extra minutes to do.

Yup, that's what I was thinking molded progressive on the front and a round seg on the back, doesn't need FF unless you want the line to be invisible.

[HarryChiling]

His rx is as follows: -2.75 -.75x 90
-3.50 -.75x90 w/ +2.50 add

I have him in full metal round frame in 44 eye to keep thickness down
I requested cr-39 to give him optimum optics, w/AR

Rx:
OD: -2.75 -0.75 x 090
OS: -3.50 -0.75 x 090
Add +2.50


Frame Demensions:
A: 44
B: ?
ED: ?
Dbl: ?

Biometric Data
Monocular PD: ?
Fitting Height: ?

[drk]

Go, Harry, go!

How in the world do you get a back side round seg w/o freeform???

[THE MEB]

I am at home on saturday night, so I don't have exact box measurements or pd's, but here are very close proximities thereof:
PD'S 32.5/32.5 distance B 41 ED 44 DBL 19 A 44
SEG HIEGHT 19.5 ON PROGRESSIVES 11MM FROM TOP OF FRAME ON ULTEX-LIKE TOP BIFOCAL

The patient, an ENT doc, has been in an overview, from me for the last 20 years. He won't mind that top is not invisible, his ultex(upper bifocal of overview) certainly isn't.
I called a custom lab which I hvae used on rare occasions, and they told me they could laminate an rd40 on upper part of comfort. They need the progressive to be clean, no scratch coating, for it to laminate correctly, which we can get a comfort that way. The only drawback would be that segment would protrude 2mm out from the base lens. I have ordered their laminate work previously, and like their results. The price ends up being the same as a 1.60 comfort in FF, with rd45 on top.

[jaross]

I am a little confused as to what is so complicated about this rx. I have never worked in a lab myself, but I order progressives w/ similar rx frequently. I would normally use a Seiko Proceed. If there is something I'm not getting, please explain. Thanks.

[THE MEB]

the deal is, not only is it a progressive lens, but there is a bifocal added on the top of the lens too, same concept as a quadrifocal, if you have seen or heard of them before. If you haven't seen a quadrifocal, it's younger brother, the double D, you may have heard of before.

[Jacqui]

The easy way would be to use a molded progressive and have someone like Three Rivers cut an Ultex on the minus side. This should be no big deal for them to do. Also this would be much easier than trying to get a freeform progressive to come out properly on an ultex blank.

[THE MEB]

HMM, I will bring it up to him, the owner of 3R, the person that has been unable to help me after trying for 2 months, or maybe I should consider another lab? Quite honestly, if in fact a molded progressive with a backside ultex seems doable and appropriate, it concerns me that that possibility has not been considered heretofore with them. Heaven knows I have bugged them enough about this particular order, after it didn't come in after the first month. I am just sayin.

[Jacqui]

If they can't, or don't want to do this, then send it to Quest Optical. If I had freeform I'd do it for you gratis just to prove it can be done.

[THE MEB]

Wow, you the G-MA!!! Thank you for not only your concern, but also your generous offer, which I would never consider taking advantage of, by the way. Have never heard of Quest Optical, but I would take your word for their ability to do a job like this. Thanks again.

[Jacqui]

I'm trying to find contact info for you

[Jacqui]

Check here http://www.questopticallab.com/

[LENNY]

Check here http://www.questopticallab.com/

They only work with wholesale labs!

But Mike is the best!

He is also on the optiboard

[Jacqui]

They only work with wholesale labs!

But Mike is the best!

He is also on the optiboard

Lenny, you're from The City, you should be able to figure out some way to get it done. ;)

[HarryChiling]

Give me more info?

Need the B measure for sure and a fitting height, also what power in the top seg. It can be done on a traditional machine and I'm itching to do it.

[Jacqui]

Give me more info?

Need the B measure for sure and a fitting height, also what power in the top seg. It can be done on a traditional machine and I'm itching to do it.

How ?? PM me.

[HarryChiling]

How ?? PM me.

This ones better show then tell. Often I post an explanation of how it can work only to find later someone disregarding my techniques without ever first verifying if it will work or not. If I can get the parameters of this lens I will make it then post a step by step explanation of how I made it. Believe me though when I say it can be done what I mean is it will be done.

[LENNY]

Lenny, you're from The City, you should be able to figure out some way to get it done. ;)

I think the easiest way is to use a SF FT28 or round seg blank and do freeform progressive on the back!

[DragonLensmanWV]

I got to thinking that one lens you never hear about anymore is the Read-Rite. Basically it was a minus add Ultex where you'd have your distance in the seg area and your near would be the rest of the lens. So I had some time to play today......:D

[DragonLensmanWV]

So how's it going Harry?
Inquiring minds want to know.