Multi focal lens design, history and optical principles

Multi-focal lens design, history and optical principles

Optical principles of multifocal lens design ,[object Object]

Franklin’s Bifocal ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Solid Up curve Bifocal ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Perfection Bifocal ,[object Object],[object Object],[object Object],[object Object]

Cemented Kryptok Bifocal ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],F2 F1 F3 F4

First commercial Kryptok Bifocal ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object]

First commercial Kryptok Bifocal ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],F1/ ω 2=-f2/ ω 2

Straight top bifocal ,[object Object],[object Object],[object Object]

Ultex lenses ,[object Object],[object Object],[object Object]

Executive bifocals ,[object Object],Cu Cs Ru Rs

Double segment bifocals ,[object Object],[object Object],[object Object],[object Object]

Trifocals Addition requiring more than +1.75DS 6-8mm segment height

Performance of multifocal lens

Optical performance of a bifocal lens can be considered in terms of ,[object Object],[object Object],[object Object],2 bifocal lens may have three centers 1) dist optical center 2) seg optical center 3) resultant optical center

Multi focal lens design, history and optical principles

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Multi focal lens design, history and optical principles