Transitions trans-bonding

[optical24/7]

I know Transitions uses imbibing on CR39 ( transitions dye heated into the front surface) and trans-bonding on other materials ( like the poly lens pictured here.) I've thought the trans-bonding was done on the convex surface of the lens, like Sun Sensors with their layer that would peel off at times. But this picture clearly shows that they must use a cover lens on the front, (similar to how polar lenses are made) with the transitions material sandwiched between. These lenses are knife edge ground at the areas showing up with no transitions. I just found this interesting and wanted to share. I personally have not seen this before.

[optical24/7]

I also calipered these at the Transitions line. Cover lens is approx. .3mm thick.

[Lelarep]

That is interesting. I wouldn't have guessed that was the setup. Good info and insight.

[lensmanmd]

I know Transitions uses imbibing on CR39 ( transitions dye heated into the front surface) and trans-bonding on other materials ( like the poly lens pictured here.) I've thought the trans-bonding was done on the convex surface of the lens, like Sun Sensors with their layer that would peel off at times. But this picture clearly shows that they must use a cover lens on the front, (similar to how polar lenses are made) with the transitions material sandwiched between. These lenses are knife edge ground at the areas showing up with no transitions. I just found this interesting and wanted to share. I personally have not seen this before.

STs are LifeRx, which are not embedded, but like polarized, laminated.

[optical24/7]

I thought Transitions took over making st's themselves a year or so ago.

[Sledzinator]

I thought Transitions took over making st's themselves a year or so ago.

My understanding of the Poly FT28 trans is that it is poly on the back and laminate a trivex transitions front layer. Its actually a hybrid.

[Don Gilman]

FYI. Sunsensor is in mass so you will not grind thru it.

[Don Gilman]

FYI Sunsensor is in mass so no issue grinding thru it.

[Tallboy]

I also noted that later generation poly trans spherical blanks have this issue - and also get darker than they used to... Happened around the same time the st28 "poly transitions" blanks came out. Not to spread unfounded gossip, but I figured they were also using the trivex front surface now.

If you notice, trans poly has MUCH better looking ar color than regular poly. Way fewer abberations, better color uniformity and less rings then poly from the "same company. Looks as good as 1.50 with Crizal...

[Uncle Fester]

If you notice, trans poly has MUCH better looking ar color than regular poly. Way fewer aberrations, better color uniformity and less rings then poly from the "same company. Looks as good as 1.50 with Crizal...

I know some labs will not, but my lab will do clear ft poly but not FT Trans Poly because of issues with it running at the segment. Avance AR on all other FT have no issue. Will this production technique change that?

[Tallboy]

I know some labs will not, but my lab will do clear ft poly but not FT Trans Poly because of issues with it running at the segment. Avance AR on all other FT have no issue. Will this production technique change that?

I don't know for sure - but my lab outsources all Crizal flat top jobs regardless of material because of so much running on the segment issues. I don't know where they send them too though, I always figured it was an Essilor lab like Omega. The rest of their crizal they do in house (to the best of my knowledge.)

[optical24/7]

It's not the AR on Crizal that's the issue with build-up on the seg line. It's the TD2 hard coat underneath that builds up if you don't have the right (read expensive) coating equipment. Optogenics' lab manager told me this a number of years ago. ( They have this said equipment and do all Crizal in house).