Line and No Line Bifocals - What's the Difference?

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Phil Coker from LaHaye Total Eye Care tells us about the difference between line and no-line bifocals.

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Mandy Riddler
Mandy Riddler
19 October 2019

still not understanding why progressives have this out of focus at the sides? Why cant they just be made to change power gradually all the way down the lens?

mrdhksan
Mrdhksan
10 June 2019

In this video, a ‘no-line bifocal’ is referring to a multi-focal or progressive lens. As you stated, progressive lenses alter peripheral vison. I would like to know if it’s possible to have a ‘real’ no-line bifocal. One where, there are only two vision corrections (upper for distance, lower for reading), with no alteration of peripheral vision, but with *no line*. I do not understand why this does not exist (if it does not). The idea is that there is near ‘instant’ transition and in the vertical axis only. Is it not possible to have both a half-height reading power lens (bottom half) and a half-height distance power lens (top half) fused together to form a single full-height lens with no line? If the powers of both are small (ex., +1.50 reading /–1.25 distance), could this not be possible, since the difference in thickness of the glass would not be that great?

Himanshu Gusain
Himanshu Gusain
09 February 2018

No line biocal is progressive??

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