67 , 69 The corneal incision associated with cataract surgery can also impact the final HO-WFE, inducing spherical, trefoil, or tetrafoil HO-WFE for a 5.0- or 6.0-mm optical zone, although the effect may not be significant for a 3.5-mm pupil size. 70 Posterior capsular opacification of the IOL can increase the HO-WFE, particularly trefoil, but this can be remediated with Nd:YAG laser posterior capsulotomy. 71 Multifocal IOLs can provide targeted amounts of negative SA to increase a patient’s depth of focus and assist
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