I honestly don't know. I'd either make some up on plano demos and experiment or you could try asking around on OptiBoard. Never cut a round seg in my life. Sorry - John
No. Round segments are different. I pinched this from over on OptiBoard. Honestly I think I did one once and have had zero luck finding anyone who knows much about round segments. Wish I did. :idea: I thought i would cover the correct way to mark up round segs for edging, more especially for some of the newcomers, in the business. If the round seg is a cylinder lens then you lay it out on axis and fit the bifocal between the lines after setting the total decentration. If the lens was ground correctly your center dot will be in where its suppose to be......................................... .........The problem come with sphere only lenses. First after you dot the lens up in your vertometer, wipe off the two end dots as the center dot is all you will need. Now lets say the decentration is distance 2.5 in and seg 1.5 in, a total of 4 in. Next set the total decentration at 4 in. Line up the bifocal between the lines as even as you can get and now rotate the lens either right or left, depending on which eye your doing. Rotate it back until the dot is now showing 2.5 in. Now when you stamp the lens with the marking cross you should measure the distance oc at 2.5 in and the total as 4.
Hello Laramy K... aqui otra vez saludandote y darte las gracias por seguir ensenandonos cosas interesantes de la Optica...Saludos...
You are very welcome.
Hi, Laramy, here looking your interesting class about Straight Top Multifocal Layout and Decentration...thank you...
This is so great!! I just don't know how to said how thankful i am
"Thanks" works just fine! ;-) John
Thanks you so much you are unique!!!! Great help!!!
You are welcome.
thank you very much
does this rule apply for round segs also
I honestly don't know. I'd either make some up on plano demos and experiment or you could try asking around on OptiBoard. Never cut a round seg in my life. Sorry - John
Thank you for your helping us
Thanks for watching, Khalid!
Thank you very much sir...
Thanks, as always demistified
For round tops to you do the same?
No. Round segments are different. I pinched this from over on OptiBoard. Honestly I think I did one once and have had zero luck finding anyone who knows much about round segments. Wish I did.
:idea: I thought i would cover the correct way to mark up round segs for edging, more especially for some of the newcomers, in the business. If the round seg is a cylinder lens then you lay it out on axis and fit the bifocal between the lines after setting the total decentration. If the lens was ground correctly your center dot will be in where its suppose to be.........................................
.........The problem come with sphere only lenses. First after you dot the lens up in your vertometer, wipe off the two end dots as the center dot is all you will need. Now lets say the decentration is distance 2.5 in and seg 1.5 in, a total of 4 in. Next set the total decentration at 4 in. Line up the bifocal between the lines as even as you can get and now rotate the lens either right or left, depending on which eye your doing. Rotate it back until the dot is now showing 2.5 in. Now when you stamp the lens with the marking cross you should measure the distance oc at 2.5 in and the total as 4.
You are soooo awesome!!!
Awwwww... Thank you. John
Thank you so much
Thanks 👍👍
Hi,, Can we use same idea for progressive lenses?
No, not exactly. See this video instead: ruclips.net/video/IQIMLEoPO2w/видео.html
What do u mean by Height