Centration of Segmented Multifocal Lenses and Progressive
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12 Terms
Its centration reference is top line of the segment and its key difficulties; most standard and easy to align
Flat top
Its centration reference is top corners of the segment and its key difficulties; corners must be equidistant from the horizontal reference line
Curve Top
Its centration reference is no visible horizontal line and its key difficulties; hardest and requires careful MRP alignment and rotation
Round
Its centration reference is top line of the intermediate segment and its key difficulties; identical to bifocals and the lower reading segment line cannot be used
Trifocals
What is the primary reference of Segmented Multifocals?
Segment Top
What is the PD Measurement of Segmented Multifocals?
Binocular Distance PD
What is the alignment of Segmented Multifocals?
Vertical drop/inset
What is the verification of Segmented Multifocals?
Visible line
What is the primary reference of Progressive Addition Lenses?
Fitting cross
What is the PD Measurement of Progressive Addition Lenses?
Monocular PDs
What is the alignment of Progressive Addition Lenses?
Pupil alignment with fitting cross
What is the verification of Progressive Addition Lenses?
Laser engravings or ink markings