- intermediate (8.6-9.2) --> Flat K
- large (9.3-10.2) --> 0.50 flatter than flat K
- small (8.0-8.5) --> 0.50 steeper than flat K
Adjust for corneal toricity:
- steepen slightly if toricity is between 1.25D and 2.ooD
- consider toric design if >2.00 corneal toricity
Misc
- steepen the GP if the lens rides nasally or temporally
- flatten the GP if it rides inferiorly
- increase the optical zone and overall diameter if the GP rides superiorly
Piggyback fittings:
- observe for excessive apical bearing or superior alignment with seal off of a GP (results in a "swirl staining")
- select high-DK silicone hydrogels
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1 comment:
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