Clinical assessment of defocus curves after Excimer Laser presbyopia surgery using aspheric ablation profi les

Resumen

PURPOSE: To assess binocular visual acuity (VA) through the evaluation of defocus curves in patients who underwent correction of spherical aberration and micro-monovision using PRESBYOND Laser Blended Vision (Carl Zeiss Meditec). SETTING: Universidad Europea de Madrid, Madrid, Spain. METHODS: A prospective study of 80 eyes from 40 patients that underwent PresbyLASIK surgery. Patients were divided into 2 groups according to their preoperative spherical equivalent (SE): group I (range +0.5 to +3 diopters (D) and group II (range −0.75 to −5.5 D). Refractive changes, uncorrected distance and near VA (UDVA and UNVA, respectively), and independence from glasses were assessed. RESULTS: Mean age of patients was 47.75 ± 4.38 years. Defocus curve of group I showed pre- and post-operative UDVA of 0 logMAR, while intermediate visual acuity (IVA) at 67 cm was 0.10 to 0.09 logMAR, and at 33 cm VA increased from 0.47 to 0.41 logMAR. Pre- and post-operate UDVA in group II was 0 logMAR, while for IVA it decreased from 0.06 to 0.11 logMAR, and at 33 cm it decreased from 0.34 to 0.44 logMAR. Independence from distance spectacles was achieved by 100% of patients in both groups, whilst 91.4% of group I and 61.7% of group II achieved independence from near spectacles. CONCLUSION: PresbyLASIK treatment is eff ective for both myopic and hyperopic patients because it reduces presbyopia symptoms and corrects distance refractive error in the same procedure, thus off ering greater independence from spectacles. Defocus curves provide a useful method to assess visual capability after refractive surgery.