lens liner

[ellivron55]

A controversial one here.Is the occasional use of a lens liner inventive and brilliant engineering or a complete nono in a service industry.This entered my mind today as a lens for an urgent job came off the edger a sliver too small.Luckily I had another in stock but if I did not????????. I am cowering in the corner waiting for the barrage for even having such a thought.
thanks
pete

[Jedi]

Temporary fix until you get a new lens in or to salvage an old pair. I went ballistic the last time I saw liner on a new pair.

[Jo]

Like Jedi, I wouldn't put liner in a new pair.

[Fezz]

Lens Liner...whats that? ;^)


I try not to use it at all. On occasion it has come into play, but I really try to avoid it.


Fezz
:cheers:

[LENNY]

I use silicone one!
Espesialy on those Sunsensors!

[Snitgirl]

Ditto to Jedi

[Cindy K]

I don't have a problem using liner if I'm remounting an existing pair of lenses into a new frame in an emergency situation, or trying to gain a future client by fixing something another dispensary let loose with a lens too small, but in a new pair of glasses NOOOOOOOOOOOOOOOOO!

It kills me when someone brings in a pair, made elsewhere, and the liner has never been affixed to the frame, but just left loose. Come on, people, if ya gotta use the stuff, at least melt it in with acetone, will ya?

[Chris Ryser]

Lens Liner...whats that? ;^)


A lens liner fills the space left that originated by:

a) making the lens a fraction too small

b) shrinking of the plastic lens after a certain time

Today everybody purchases a one mile long roll of plastic liner for all emergencies or non emergencies,............................. because nobody wants to admit they use them.

In the old days instead of liners opticians used to collect the lead sheets that used to cover the top of good bottles of french wine. These sheets were inserted with the lens that needed a little boost of diameter and then cut with a razor blade along the edge and became totally invisible.

To reduce the diameter of a metal frame a fraction and not use a liner you would file or grind off some material at the screw block which always was oversized exactly for this purpose.

Liners would also be used with metal frames when mounting very thin glass to reduce the strain and pressure on the lenses, which would prevent the lens edges from chipping.

So as you can see...............the use of liners is not a total shame subject.

:idea:

[Barry Santini]

A lens liner fills the space left that originated by:

a) making the lens a fraction too small

b) shrinking of the plastic lens after a certain time

Today everybody purchases a one mile long roll of plastic liner for all emergencies or non emergencies,............................. because nobody wants to admit they use them.

In the old days instead of liners opticians used to collect the lead sheets that used to cover the top of good bottles of french wine. These sheets were inserted with the lens that needed a little boost of diameter and then cut with a razor blade along the edge and became totally invisible.

To reduce the diameter of a metal frame a fraction and not use a liner you would file or grind off some material at the screw block which always was oversized exactly for this purpose.

Liners would also be used with metal frames when mounting very thin glass to reduce the strain and pressure on the lenses, which would prevent the lens edges from chipping.

So as you can see...............the use of liners is not a total shame subject.

:idea:

Right on, as usual Chris! I couldn't have said it better!

[OpticLabRat]

I have used liner many times. But I do it right and the lenses will stay in forever. I never had an issue with it.
Another Idea besides shaving the barrel is....
Take a small drop of "watery" superglue and roll it all the way across the eyewire, top and bottom.

Before anyone freaks out about glue keep reading!!!

Let the drop of glue keep rolling until it evens out and starts to dry. Wait a few minutes until it is completely dry and then mount your lens.
WALLA!!!!
Liquid eyeliner that is virtually undetectable.

Of coarse the best solution is to calibrate the edger so it does not cut small:cool:

[Jedi]

Very interesting Chris, especially the comment about mounting thin glass. Though I feel today with the edgers we use and having quality lab techs the need for liner should be a quick fix in emergency not a long term solution.

[Chris Ryser]

Very
Though I feel today with the edgers we use and having quality lab techs ..................


I believe that having today's high tech machines eliminates more and more the need for quality lab techs....................and maybe not.................

When I started my surfacing and edging in the mid 1960s Coburn was the only one advertising optical machinery with short clad sexy blondies operating the generator on their pamphlets.

Their sales rep, Bob Roberts explained that the need for highly qualified optical people in the lab was a thing of the past and marked the order for good size surfacing and edging lab on the inside of a match book.

Once set up we learned in trip;e time that need for very highly qualified technicians was the most important thing at that stage, and we had to convert paying higher salaries.

:hammer:

[chip anderson]

You can go even a step further than Chris, You can actually (Yes, you) unsolder the eyewire block and move it down the eyewire. Of course you will have to clean up, trim the excess eyewire and re-paint, but it can be done. When would you do this? When you have some very expensive undersize lenses.
Chip

[rbaker]

Repositioning the endpieces was not just for undersize lenses. It was not uncommon to stock only the largest size gold filled frames and cut the eyewire down to the appropriate eye size. We had hardwood formers (looked like patterns without the holes and beveled around the circumference) and hardwood rollers to reshape the eyewires. Of course, that was back in the “good-ol” days when opticianry was a craft that took many years to master.

We also stocked various rolls of gold filled eyewire (V-in cross section) endpieces, guard arms, solders and had all of the tools required to fabricate frames. My boss could fabricate a frame from a customers drawing or duplicate a discontinued frame in about an hour. Of course, he was exceptional but not out of the ordinary.

Can you imagine an optical shop doing this today?

[Barry Santini]

"50" is OK to use...whenever...

"50H" is only for truly extraordinary circumstances...One roll should last a lifetime!

Barry

[HarryChiling]

"50" is OK to use...whenever...

"50H" is only for truly extraordinary circumstances...One roll should last a lifetime!

Barry


.... or a day ;)

[dcarew]

Of course!
Yay, Chris and Dick!
There were so many "fixes" in the olden days. Lens liner is one. Creative solutions don't exist anymore. Just Re-order. Lenses, frames, whatever.
I learned from a Geezer and am now a geezer and I still get creative sometimes. You don't want to have to use liner, but occasionally....
Dee

[jofelk]

Never use liner in a NEW pair of glasses!

[dcarew]

In optics, as in life, there are no absolutes.

[Aarlan]

I beg to differ, There is no reason to use lens filler in a NEW pair of glasses...Period. It is a pride issue, and if you have to eat a pair of lenses because you were careless, then that is the price you pay for carelessness. To use lens fillers for an outside repair or emergency quick fix for some reason (perhaps to order a new pair of lenses to make up for the shoddy first pair) is acceptable, but in a finished completed NEW PAIR? Absolutely not...and in this case, in optics there are absolutes (as in life there are the absolutes of death and taxes).

AA

[Grubendol]

In optics, as in life, there are no absolutes.


Do, or Do not. There is no try.

Only Sith Think in Absolutes

[dcarew]

I agree, pride in work is important, and we all would like our work to be perfect. I also agree that a new pair of lenses shouldn't have a liner, however, there are occasionally patients moving away, patient's frame is misshapen, any number of things can occur.

It doesn't mean the work is carekess, as you say. Some machines are old, some patterns aren't just right, on and on.

All I'm saying is that Never is a long time...especially in optics, where Murphy's Law rules.

Thank you for your responses!

Grubendol, you're hilarious.

[FVCCHRIS]

Hey Grub, 20 days left huh? Do you hear that cello music from Jaws in the back of your head? Is the tempo starting to pick up a bit? Are you anticipating the screaming violin crescendo coming up?? Ha-Ha, Just kidding, best wishes for only the best in your marraige, Chris.

[Grubendol]

by the above post, you should probably notice I'm a SW geek. So, not jaws, it's more like the Imperial March ;)