I've never seen this bifocal...

[EyeFitWell]

Anyone know what it's called? It looked like a ST and the bottom was circular as usual, but the top had a slight curve instead of being straight. The center of the line was about 1-2mm higher than the edges.
I can see the benefit of it (I'm guessing it puts the OC more into the bifocal and not so close to the top of the seg giving a better field of view).
I have never seen it before, and I wanted to learn about it. Any info is much appreciated!

Note: I'm not talking about a round or Ultex style.

[Judy Canty]

Sounds like a old curve top to me...I think it was a B&L design.

[GOS_Queen]

Anyone know what it's called? It looked like a ST and the bottom was circular as usual, but the top had a slight curve instead of being straight. The center of the line was about 1-2mm higher than the edges.
I can see the benefit of it (I'm guessing it puts the OC more into the bifocal and not so close to the top of the seg giving a better field of view).
I have never seen it before, and I wanted to learn about it. Any info is much appreciated!

Note: I'm not talking about a round or Ultex style.

The ones I've seen have been worn by people from Europe ~ maybe it's a more popular lens over "there" ... LOL ??

[EyeFitWell]

Is it still available? This lady was very insistant that I do all I could to match her current set up. She is very sensative to changes...
I'm not sure about this, but I would think that the curve vs. flat top wouldn't change the amount of prism in the segment...or would it?
Add is 2.75, so even if it's 2mm, that's only a change of half dioptor of prism, right?

[Ladyoptician]

Is it still available? This lady was very insistant that I do all I could to match her current set up. She is very sensative to changes...
I'm not sure about this, but I would think that the curve vs. flat top wouldn't change the amount of prism in the segment...or would it?
Add is 2.75, so even if it's 2mm, that's only a change of half dioptor of prism, right?

I think Southern Optical in Greensboro, NC may have it. I have seen those before and at that time used this lab.

[EyeFitWell]

Ah, southern, the lab that made me bang my head against the wall...lol
I had the WORST experience with them, even though I know they even got Lab of the Year, right? Thanks for the tip! I'll give it a try.

[ikon44]

The Lens is Called a C seg,plenty of availability here,but at $2 to the pound ,not a practical purchase.

[DragonLensmanWV]

I assume we're talking about a plastic lens, or glass?
Weren't the original Rodenstock Aspheric Flattops curved like that also?
Indo's Superfin also has a curved top.

[FVCCHRIS]

I'd bet it's one of those Rodenstock Cosmolite bifocals. I liked them when they came out with them. Nice aspheric design in cr-39 for Plus rx's. Are the current lenses Plus?? Chris..

[MELVIN]

The lense could be a curve top.

[Fezz]

Lens is a curve top. Check Indo www.Indo.es , Zeiss ,and I think Rodenstock used to make them as well.

A lot of Europeans will present with these.

[CME4SPECS]

I agree, Rodenstock Cosmolit.

[EyeFitWell]

Chris,
The current lenses are plus and CR-39. However, she just had cat surg so now it's minus a quarter with some cyl.

[FVCCHRIS]

That either the Cosmolite bifocal or a lens by Bristol called Bristol-lite(curve-top also) is still available and can be done in the Rx you mentioned so Go-for It!:cheers: Chris.. Both lenses are cr-39 only..

[EyeFitWell]

Thanks Chris!
I guess I'd better leave well enough alone and stick with what she's used to. Thanks again to everyone!

[Jacqui]

Standard curve top bi. AO used to call them a "Sovereign". The last pair I needed came from Laramy-K

[CME4SPECS]

The lenses are aspheric and will cost you more than standard cr-39. You better call and get a quote on the lenses.

[chip anderson]

If the top curves slightly down it's a panafocal (or panofocal) by B&L. Completly eliminated jump on going into seg. Dropped because it was too expensive to make.

Chip

[Jacqui]

The lenses are aspheric and will cost you more than standard cr-39. You better call and get a quote on the lenses.

Never seen any that were aspheric. They were always spherical, especially the glass ones.

[CME4SPECS]

Never seen any that were aspheric. They were always spherical, especially the glass ones.

Bristolite and Cosmolit are both aspheric.

[Judy Canty]

Panoptik?

[CME4SPECS]

Anyone know what it's called? It looked like a ST and the bottom was circular as usual, but the top had a slight curve instead of being straight. The center of the line was about 1-2mm higher than the edges.
I can see the benefit of it (I'm guessing it puts the OC more into the bifocal and not so close to the top of the seg giving a better field of view).
I have never seen it before, and I wanted to learn about it. Any info is much appreciated!

Note: I'm not talking about a round or Ultex style.

Are they plastic? That would help us. Some people are thinking OLD OLD lens designs

[chip anderson]

Need to know if glass or plastic and if top is curved down at edges or up at edges./

[EyeFitWell]

Chris,
The current lenses are plus and CR-39. However, she just had cat surg so now it's minus a quarter with some cyl.

:bbg:

[EyeFitWell]

Need to know if glass or plastic and if top is curved down at edges or up at edges./

Center of bifocal is about 2mm higher than edges of bifocal. Curved up I guess.