Multi focal lens performance 2

Performance of multifocal spectacle

Learning objective ,[object Object],[object Object],[object Object],[object Object]

TERMINOLOGY Segment Inset = (IPD-NCD) /2 Total Inset = (GCD-NCD) /2

Lateral placement of optical centre of the segment ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Qs. ,[object Object],[object Object]

Vertical placement of optical centre of the segment ,[object Object],[object Object],[object Object]

Optical location of various segments of Bifocals

Differential displacement (Image jump) ,[object Object],[object Object],[object Object],[object Object]

Differential displacement at the segment top (image jump) ,[object Object],[object Object],[object Object],[object Object],[object Object],Image jump= d Fa

Differential displacement at the segment top (image jump) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Differential displacement at the reading level ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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

Total displacement at the reading level ,[object Object],[object Object]

Chromatic aberration ,[object Object],[object Object],[object Object],[object Object]

Image jump in different designs ,[object Object],[object Object],[object Object],[object Object],[object Object],8

Multi focal lens performance 2

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Multi focal lens performance 2