Thank you for your reply. and what means the CA?
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Thank you for your reply. and what means the CA?
I mean if the prism be cancelled in the progressive lenses, that would affect the adaptability of patient?
IF the Thinning prism be cancelled ,what will be affected except cosmetic?
If I know the prism diopter(△,index 1.5),how to caculate the prism top angle(°)
What are differences of the progressive lenses that have thinning prism or not when a person wears the lenses? I mean it will affect adaptation?
What representative is QPC in Satisloh M380 machine?
and What is the QPC rate, QPC power?
When designing the lenses of different Index materials, Do they use the same index of 1.530 to design the front curve, so as to measure the front diopter curve using the present diopter meter?
Thanks for your anwser.
I just want to know what's means if a semi-finished blank marked base 4.50, the material index is 1.502. According your reply, the Base 4.50 index is a "shop index" of...
What does the True Base of Blank means?
Do the true base of front surface of lenses have same Index in different index of refraction?
Who can give me a "Humphrey automatic refractor operator's manual"?(PDF)
Only for cute?
but after edging, the upside of lens is thinner than downside much more in generally.
Why should the progressive Lens be added the thinner prism? After adding the thinner prism, is it easy to suit? or is it only for cute?
Thanks a lot,
Just visited here, I've got so useful software.