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목적 : To assess visual outcomes and optical quality after presbyopia correction using an aspheric ablation profile and a micro-monovision protocol.
방법 : Fifty-four eyes of 27 patients (mean age, 50.2 ± 7.5 years) were enrolled. The values of modulation transfer function (MTF) cutoff frequency, Strehl ratio, objective scattering index (OSI) and accommodation range using the Optical Quality Analysis System (OQAS) were quantitatively assessed. The OQAS variables were compared to 54 age-matched normal eyes of 27 volunteers. Preoperative and postoperative contrast sensitivity (CS) at far (3 m) and near (40 cm) distance, and higher-order aberrations (HoAs) were analyzed. Subjective visual satisfaction was evaluated by self-reported questionnaire.
결과 : One year after presbyopia correction, the mean MTF cutoff frequency was 36.47 ± 9.39 cycles/degree (cpd) and the Strehl ratio, OSI and accommodative range were 0.19 ± 0.04, 1.03 ± 0.47, and 1.18 ± 0.31 diopters (D), respectively. We found no significant differences in the MTF cutoff frequency (independent t-test, P = 0.551), Strehl ratio (P = 0.466) and OSI (P = 0.202) between the surgery and control groups. The OQAS accommodation range significantly differed between the presbyopia correction and control groups (P = 0.004). Postoperative CS at far did not demonstrate significant changes at any values of cpd, except for CS at 12 and 18 cpd at near which showed statistically significant improvement (paired t-test, P = 0.020 and P = 0.008, respectively). The HoAs in the root mean square (RMS) significantly increased after presbyopic correction surgery (paired t-test, P = 0.002). Visual performance by self-reported questionnaire revealed satisfactory results in terms of subjective visual quality improvement.
결론 : Objective optical quality parameters showed good visual outcomes. Postoperative CS at far was not significantly different from preoperative data, while CS at near and HoAs changed significantly postoperatively compared to the preoperative value. Subjective visual quality assessed by self-reported questionnaire in the presbyopia correction group showed satisfactory results.
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