I just started taking classes for my ABO.. I was wondering if anyone could help me with a question?
I woudl like to know how to check a seg height on a progressive lens?:finger:
thanks
sugar
I just started taking classes for my ABO.. I was wondering if anyone could help me with a question?
I woudl like to know how to check a seg height on a progressive lens?:finger:
thanks
sugar
find "invisable marks" on lens located N&T. Spot same. Go to progressive lens identifier (chart from your lab or OLA) and see how many mm above this mark the center should be. Lateral center should be locatable at this height with lensometer.
Progressives have laser marks on them. You need to find the laser marks, you can usually see them by holding the lens up to good light. Mark the laser marks.
Next you need stickers made for that progressive or a cut out chart for that progressive. With stickers you lay the stickers on the lens and line up the laser marks with the marks on the stickers. With a cut out chart you lay the lens on the chart and mark the fitting cross.
thank you
I think i have it now I know how to fing tha maeking so that was a great help....
:p
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