Freeform Ft

[LENNY]

Is it possible with the newest Freeform technology to grind a FT seg on the front or on the back of the lens and erase the ledge (make it smoother)?
It is my understanding that this can be done with round seg...

[Fezz]

You are correct about the round segs. I have never seen anything about a Ft. Three Rivers Optical in Pitsburgh, Pa is doing the round segs. Maybe you could call and speak to someone there. Sorry, I do not have a number handy.


Fezz
:cheers:

[LENNY]

Are they doing it on the back?
Do they do blended?

[AWTECH]

Multi power lens vs. dual power

Freeform segments:

It is in theory possible to do a flat top freeform seg with a blended line of approximately 1 to 2mm. I think the round seg works great. We have had this technology for a few years now but found in the market place PALs are what 90 percent of the Opticians think is high tech and expensive. They think a limited 2 powered lens is not high tech. The advantages to a 2 power lens product is that throughout the fied of each segment you have usable lens area. With a PAL you do have a significant portion of the lens that is not usable. Freeform proper PAL designs do offer about 30% more usable lens area than a traditional PAL but still not the complete lens area.

[Fezz]

Lenny,
My understanding is that it is on the front surface, similiar to a blended. I have only done one and that was a while ago, and don't remember. I believe they also offer various sizes based on frame "A" size. They have a 22, 25, and 28. It can be clear or Transitions. I can't offer much else, sorry.


Fezz
:cheers:

[jherman]

How?

How can you have a Free Form Transition?




quote=Fezz;157658]Lenny,
My understanding is that it is on the front surface, similiar to a blended. I have only done one and that was a while ago, and don't remember. I believe they also offer various sizes based on frame "A" size. They have a 22, 25, and 28. It can be clear or Transitions. I can't offer much else, sorry.


Fezz
:cheers:[/quote]

[HarryChiling]

How can you have a Free Form Transition?

Jmaes, freeform is just the process and can be used on any blank. Although the front surface of a transition blank cannot be ground the back can with a free form design.

[Chris Ryser]

They think a limited 2 powered lens is not high tech

........................but found in the market place PALs are what 90 percent of the Opticians think is high tech and expensive. They think a limited 2 powered lens is not high tech.

I think that that they do not think.............or have been brainwashed not to think, or money talks louder than thinking.

:hammer: :hammer: :hammer:

[Fezz]

Jim,

I am not an expert on the subject at hand and my info may be a bit suspect. The product is from Three Rivers Optical(www.3riversoptical.com). They cal it "Free" Lens Series, TR O seg and TR O Blended Seg. My understanding is that it was made using the "freeform" technology. We all know how that word Freeform is misunderstood. The list of material availability lists, platsic, poly, poly polarized, transitions, 1.60, 1.67, 1.70, polarized mid index, etc. This list is from the August issue of Opticourier, last page(51). I do not work for or have an interest in this company. Good luck on your search.


Fezz
:cheers:

[AWTECH]

Freeform Transissions

James Herman:

How can you have a Free Form Transition?

We are going to release a freefrom PAL Transission product within about 30 days. It starts as a spherical semi-finished blank with transisions on the front surface. We then apply our PAL individual design to the back surface.

If you want more information on this product contact me via e-mail or private message.

[jherman]

I was thinking of Free Form Gererating

not Free Form design, sorry for the confusion.

[AWTECH]

Freeform

James Herman:

I was thinking of Free Form Gererating
not Free Form design, sorry for the confusion

Now I am confused by this statement please clarify. My goal is to help board members understand freeform processes and the application of these processes to produce lenses.

Freeform manufacturing is only good when used with excellent design software.

[jherman]

?????

manufacturing front and back surfaces, Free Form Generation?

[AWTECH]

Freeform

James, thanks for the clarification. I contend many freeform front and backside designs were created to avoid existing patents on spherical front surfaces.

[Fezz]

Allen,
Do you have any insight as to the above in question lenses? If they are truly a freeform design using the freeform surfacing capabilities, then Ice-Tech should at some point be able to produce the same offerings, true?


Fezz
:cheers: