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Correcting residual refractive error may improve distance visual acuity in apodized diffractive IOL patients
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Correcting distance residual refractive error may improve distance visual acuity in patients with apodized diffractive IOLs, a prospective study by researchers in Spain suggests. However, near visual acuity may be maintained without correcting the residual refractive error, the authors noted.
Luis Fernández-Vega, MD, PhD, and colleagues at Fernández-Vega Ophthalmological Institute, Oviedo, performed bilateral lens extraction and implantation of an AcrySof ReSTOR Natural IOL (Alcon) on 150 eyes of 75 patients. Eyes were then separated into myopic and hyperopic groups, and the researchers used vector analysis to evaluate residual refractive errors to determine the tolerance of visual acuity to postoperative defocus.
After correcting the distance residual refractive error, the researchers reported a statistically significant improvement in uncorrected distance acuity in both groups (P < .001).
However, there was no difference between uncorrected distance near acuity and best distance corrected near acuity, the authors noted.
There was a significant trend toward worse visual acuity as a function of spherical equivalent value that was significant only for uncorrected distance acuity (P < .001).
"No significant correlations were found for best corrected distance acuity, uncorrected distance near acuity and best distance corrected near acuity as a function of [spherical equivalent]," they said.
The study is published in the February issue of Journal of Cataract & Refractive Surgery.