green transitions

[apaul]

Hi All

Could someone out there please tell
me if green transitions are still available
Im not having much luck
Im based in the UK

many thanks

Alan :cheers:

[harry a saake]

Yes, there is a company here in the states called OPTICAST, that makes all sorts of colors, i have a pair of them in gold, if not it may be called optical moulding corp, unfortunately after seeing them at vision expo i lost the info. They pretty much have any color you want as it is a dye and then after all is mixed you cast the lens, works quite well

[Jim Schafer]

Hello Harry and apaul,

As you know, Transitions® XTRActive® Green was discontinued several years ago. It was clear lens that darkened to a G-15 color and transmission. It did very well in Latin America and in Italy. Outside of the launch efforts, we never really promoted it in North America. It was perfect for high temperature climates, in fact formulated for the West Texas, Arizona and Nevada summers.

You may want to try AO·SOLA in the UK. American Optical had the XA Green b'Active PAL. Vision-Ease in the UK may have some SFSV left too.

regards,
Jim

[apaul]

Thanks for the replies Harry and Jim



Regards


Alan:)

[Jacqui]

Check with http://www.opticastusa.com/ they may make a batch for you.

[rinselberg]

Check with http://www.opticastusa.com/ they may make a batch for you.

Jacqui (or anyone)

Does your lab dispense these OptiCast USA molded lenses? I would like to know if they have developed the tecchnology yet to put an AR coating on the lens as an integral part of the lens molding process? Or do you have to take these molded lenses and use another process to apply an AR? I wonder what brand name ARs (Zeiss Carat? Clearsight Claris? iCOAT Vivix? etc.) are being applied to these molded lenses? I would guess that the vast majority of the molded lenses are dispensed without AR, however. If anyone could inform me ...

The questions man

[Chris Ryser]

Jacqui (or anyone)

If anyone could inform me ...

The questions man

Every plastic lens is molded.

CR39 and others in glass molds with liquid monomers and then cured

Polycarb is moulded by injection moulding

AR coating is a different baby altogether and to make the cermon short I found you a click on explanation.....................

http://www.2020mag.com/ce_article.as...039/lesson.htm

This course is approved for one (1) hour of continuing education credit by the

American Board of Opticianry (ABO). Course # SWJP217-1

[rinselberg]

Thanks CHRIS RYSER.

Instead of "molded lenses", I should have been more specific: Lenses made with "in-office" or "low volume" lens casting systems such as OptiCast USA, Optical Dynamics and the like. These lenses are "cast to prescription" and do not use the traditional finishing methods to achieve the final Rx. That's the specific product range I would like to know more about, as I said in my post just above. The science of AR is the same for these lenses, but the specific AR processes and products that are used --? I think that Optical Dynamics at least is planning to come out with an "in-mold AR" process option. Vacuum coat? Spin coat? Dip coat? What's in vogue? It may be a moot point, as I think that most of these shake and bake molded lenses (as some like to say) are probably sold without AR.

[rinselberg]

http://www.softlightinc.com/product_harl.html
http://www.indiamart.com/solar-vision/

Two more sources for green photochromic lenses



Eye on the web ...

[Jacqui]

looks like Rinselberg also solved the photochromic frame problem from another thread. http://www.softlightinc.com/product_harl.html

[Chris Ryser]

Thanks CHRIS RYSER.

.........................but the specific AR processes and products that are used --? I think that Optical Dynamics at least is planning to come out with an "in-mold AR" process option. .....................Vacuum coat? Spin coat? ................Dip coat?

Could you explain how do you think it is possible to vacuum coat............or spin coat..........or dip coat a lens that is curing in a mold, going from liquid state to solid state, and all of it is enclosed in a front and a back mold??????????

:hammer:

[rinselberg]

Pardon me Chris, that is not what I meant. In-mold AR is one possibility -- for example, they could spin coat a "reverse" AR stack onto the empty mold first, without permanently affixing it to the mold. Then the AR stack would transfer to the lens during the molding process. Or AFTER the cast to prescription lens is cured and removed from the mold, they could apply AR via a conventional vacuum coat, spin coat or dip coat process in a SECOND step. That's what I meant to say.

[Jacqui]

Actully I think Optical Dynamics and NexGen were going to use a thin film with the AR on it. Just place the film on both sides of the mold and fill with plastic in between. Sounds nice, at least in theory, but.......

[Chris Ryser]

Actully I think Optical Dynamics and NexGen were going to use a thin film with the AR on it. Just place the film on both sides of the mold and fill with plastic in between. Sounds nice, at least in theory, but.......

Jacqui, The outer layer of an AR coating consists of SIO2 (silicon dioxide) often with a layer of some metal oxyde underneath, which gives the color hue, as blueish, greenish and so forth.

The big secret of a good adhesion to CR39 is the hard coat, because the AR coating will not adhere properly on plastic surfaces. You do need a layer in between the two (usually what they call the hard coat), the substrate and the AR coating, that provides a superb adhesion for the two materials on each side of what you want to bond.

I can not see a film of an SIO2 layer that consists of a very hard and not flexible material, being placed properly on spherical and or toric surfaces inside a empty mold, place it on the sealing plastic rim, do the minus side the same way and fill the mold with monomer. You are still missing the bonding layer which is supposed to be cured before applying the AR coat.

Does not make sense, but I am always willing to learn something new.

.............they could spin coat a "reverse" AR stack onto the empty mold first, without permanently affixing it to the mold.

rinselberg, If you read the text on the link I gave you previously you should know that AR coating are not a spin coat application but vaporised under vacuum. And if applied on a glass mold it would adhere permantly, not needing the hard coat in between as glass and SIO2 bonds perfectly. It could only be done as an extra step.

[Jacqui]

Chris, I think what they are relying on to adhere the AR stack to the lens is the stickyness of the liquid monomer. I still haven't seen one of the units and I'm wondering if there aren't some technical problems, like non-adherence or pealing.

[Jacqui]

Chris, check out this website http://www.opticaldynamics.com/info_ar.html

[CME4SPECS]

I recently tinted a pair yellow (like kalichrome) and it turns to a nice green when exposed. The man wanted something bright yellow for night and dark in the sun. It was experimental, and he's happy, they turned out great.

[Chris Ryser]

Chris, check out this website http://www.opticaldynamics.com/info_ar.html

Jaqui, I did. ................I invested $ 38,000 in 1983 in a venture like this with another 7 Canadians at the same amount and about 35 Americans at equivalent value, and we lost it all. At least I managed to put the main player into jail for 12 month for US mail fraud.

Here is a copy of the part in question ( will print in blue)

Advanced Manufacturing Technology

· Q-2100 Cast-to-Rx Technology - providing better surface quality, better Rx accuracy, more consistent curves and better vision.

· Q-2100AR Technology - Revolutionary in-mold process bonds the AR stack with the lens as its cured, resulting in better overall AR performance

This sounds very promising , but how can you have better surfaces than the main players in the field? I would have said " at least equivalent"

Why do the ESSILORS, ZEISS, HOYA, and SOLA and many other's buy coating machines worth $250,000 to $ 5000,000 plus a piece, when you can do the stuff in the mould?
Either they are dumb (sometimes I think they are) but not that much for sure to invest that amount in machinery when it can be done easily in the mold at the same time you cast the lens.

Since I lost a bundle 20 years ago, I have been watching these molding guy's go under piece by piece. I know why, studied the whole bit, but maybe will explain it in my memoirs.

[Adam Simmonds]

If it's not too late now, you should try Marinelli. They've got an office in London. The lenses aren't Transitions but they are photochromic.

Call me on 020 7813 1234 during the day and I'll get you their number.