what side is bicentric grind put on convex or concave for glass material?
what side is bicentric grind put on convex or concave for glass material?
Last edited by redsoxfanfewany; 08-08-2005 at 10:27 PM. Reason: I forgot to put what material
I know that it can be ground on the back side but I am not sure if it can be purchased with the appropriate on the front like it can with plastic.
Slab off is always ground on the toric surface...the non segment side as in the ocular surface of the lens
Reverse slaboff is molded into the front surface and is only available in plastic...CR-39 and Younger seems to be the only manufacturer
Ed
Thanks Ed I was just thinking about who makes reverse slaboff! Are you a witch?!?!:pOriginally Posted by Ed_Optician
I just wanted to thank you for your quick response
In glass? I suppose it could be done on the ocular side, but it was traditionally done on the front of fused multifocals (which was not the toric surface)...Originally Posted by Ed_Optician
Dug around a while to find a thread. Hope this works
I have a Thin&Dark addict; wearing a D-28. Long-time customer and not afraid of cost. Walks in w/an Rx for slab-off. I found no-one to "pour a slab' (sorry for the old nomenclature). I called everyone I could think of AND everyone they could think of. I ended up ordering it in Trivex from Zeiss and am hoping for the best...Ideas?
Am I just too old or is this technology gone? Or..?
I checked on Vision Web, it looks like they do make glass T&D FT28 in my glass lab...Vision Dynamics.
I would also check with FEA since they are getting more and more in to glass and have FF capabilities.
Last edited by LENNY; 09-25-2016 at 08:31 PM. Reason: add
FEA turned me down in August. Don't know Vision Dynamics
Chadwick Optical?
They seem to revel in the odd and funky. http://www.chadwickoptical.com/
Thank you. It was available in this form in the various 'Ultex' varieties. As late as the '70s. My mentor was huge in the Univis adaptations of these 'one-piece' bifocals before the WWII. He dropped out to go corporate when Univis got socked by a patent suits and lost initiative towards R&D. Went w/Joe Cole when they bought Ferrari and Risi.
It's SO weird to be so removed from the generations that inherited their einheit from the Enlightenment. I work with people unfamiliar with algebra. I could make a B&L 70 SING in 'grade' school. Am I the last trouper that had even seen a master 'rock' a cylinder? I was too ashamed of my lab purchasing history to even call a group like the Fluegge bros...
Casey,
I talked to Scott at Fluegge Optical yesterday. He said they can do it, but for in-house clients only, no wholesale. Glenn Fluegge is an OB member and might make an exception.
http://flueggeoptical.com
WRT free-form slab-offs, I tried one (I average about 20 per year) and found the blend zone to wide (tall). Regardless, glass segmented multifocals, to the best of my knowledge, are no longer being produced in the U.S. Maybe Southeast Asia, but that seems unlikely considering the market for segmented and the time and expense required to produce it.
I just got off the phone with Duffins Optical- customer service said they can do it. I didn't have time to talk to the lab manager to confirm.
http://essilorlabs.com/lab/duffens-optical-lenexa
Hope this helps,
Robert Martellaro
Science is a way of trying not to fool yourself. - Richard P. Feynman
Experience is the hardest teacher. She gives the test before the lesson.
This is one of the best things about this community, they always go the extra mile for fellow members.
I work with Vision Dynamics and we can now do the glass slab offs. We are a specialty Glass laboratory. www.visdynlab.com.
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