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Hyperopic LASIK can improve depth of focus in presbyopic patients
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Aspherical hyperopic LASIK can increase depth of focus without affecting distance vision in presbyopic patients, according to a study.
The prospective clinical trial compared 76 consecutive patients with spherical hyperopia between +1 D and +2.5 D who were candidates for LASIK. Bilateral hyperopic LASIK surgery was performed. A conventional profile was used on the dominant eye, and an aspheric ablation profile with a target of –0.75 D monovision was used in the nondominant eye.
The correlation between postoperative spherical aberration and depth of focus was the study’s main outcome measure. In addition, the depth of focus was compared among patients in three groups: patients with an induced spherical aberration close to the optimal one (group 1); patients with an induced spherical aberration far from the optimal one (group 2); and patients in whom spherical aberration induction did not increase the depth of focus (control group), according to the study.
For near vision, the mean increase in distance-corrected pseudoaccommodation value was +0.25 ± 0.64 D for dominant eyes (P < .001) and +0.63 ± 0.55 D for nondominant eyes (P < .001).
Visual simulation for distance and near was performed in nondominant eyes of 37 patients. After the preoperative adaptive optics assessment, the mean pseudoaccommodation value at near was higher (P < .05) in group 1 compared with group 2 and the control group.
The mean optimal spherical aberration value to improve the depth of focus was –0.18 ± 0.13 µm at 4.5 mm, according to the study. – by Kristie L. Kahl
Disclosure: Leray reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.
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