Inventory Sets
Dispensable Inventory sets allow instant dispensing to most patients by using a simple cross-reference chart or the OK® Lens calculator. Our recommended sets are listed below.
Dispensable Inventory sets allow instant dispensing to most patients by using a simple cross-reference chart or the OK® Lens calculator. Our recommended sets are listed below.
1/4 diopter Flat CK and 1/2 diopter Target Power
Set Type / Flat Central K Range / Target Myopia Reduction Range
143 Lens (Most Popular Set) / 41.00 to 45.50 / -1.25 to -5.00
219 Lens / 41.00 to 45.50 / PL to -5.00
1/4 diopter Flat CK and 1/4 diopter Target Power
247 Lens / 41.00 to 45.50 / -2.00 to -5.00
323 Lens Set / 41.00 to 45.50 / -1.00 to -5.00
399 Lens Set / 41.00 to 46.00 / -0.50 to -5.00
Sample Case:
CK's 43.00/44.00 Spectacle-Rx: -4.00 Eccentricity Value = .5
Primary Lens: 43.00/-4.00(.5e) / 8.82 / 10.6 / +1.00
If Primary Lens Is Too Tight:
Up and left on the chart loosens the losses the fit but keeps the same myopia reduction. From the example above, the next loosest lens with the same base curve is 42.50/-3.50(.5e)
If Primary Lens Is Too Loose:
Down and right on the chart tightens the fit but keeps the same myopia reduction. From the example above, the next loosest lenswith the same curvebase is 43.50/-4.50(.5e)
Use the legend bellow to adjust the fit and amount of reduction
Up and Left = Loosens fit with same myopia reduction
Up and Right = Loosens fit with more myopia reduction
Down and Right = Tightens fit with same myopia reduction
Down and Left = Tightens fit but decreases the myopia recution
Right = Same fit with more myopia Reduction
Left = Same fit with less myopia Reduction
Download the OK® E-System Inventory Set Troubleshooting Chart. Download PDF
Or please contact one of our knowledgeable consultants.