This prospective study included 75 patients (50 eyes) who had bilateral clear lens extraction with apodized diffractive IOL implantation.
The eyes were divided into two groups: myopia and hyperopia. When the distance residual refractive error was corrected, there was a statistically significant improvement in uncorrected distance acuity in the myopia group and hyperopia group (P<.001). However, near visual acuity was maintained whether the residual refractive error was corrected or not.
The researchers conclude that surgeons "should analyze visual acuity tolerance to defocus caused by residual refractive errors in patients with pseudoaccommodating IOLs after considering a secondary procedure. Correction of distance residual refractive error improves distance visual acuity. However, this is not true for near visual acuity. Near acuity is maintained whether or not the residual refractive error is corrected. Cataract patients will be the ones who will benefit greatly from this outcome and distance glasses may be occasionally prescribed."
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