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KMID : 1011420200250020169
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Journal of Korean Ophthalmic Optics Society
2020 Volume.25 No. 2 p.169 ~ p.174
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Evaluation of Vision before and after Nd: YAG capsulotomy in Patients with Posterior Capsular Opacification
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Park Chang-Won
An Young-Ju
Kim Hyo-Jin
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Abstract
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Purpose: To evaluate the change in visual acuity related to differences in visual function before and after Nd: YAG laser surgery in patients with posterior capsular opacification.
Methods: Eyes of 255 patients (one eye from each patient) aged 50-79 years who were diagnosed with posterior capsular opacification and treated with Nd: YAG laser were used in this study. Optical evaluation of visual acuity using the OQAS (optical quality analysis system) was performed before and after one week and one month following Nd: YAG laser surgery. The optical evaluation parameters included the ocular scatter index (OSI), modulation transfer function (MTF), image concentration ratio (strehl ratio), and simulated visual acuity at 100% contrast (simulated VA C=100%). Simulated visual acuities at 20% (simulated VA C (contrast) = 20%) and 9% (simulated VA C=9%) contrasts were analyzed.
Results: The OSI of patients with posterior capsular opacification was 3.28±1.95 preoperatively; at 1 month postoperatively, it significantly decreased to 1.77±1.04. MTF (C/deg) increased from 18.17±4.85 to 30.33±7.14, and the Strehl ratio improved significantly from 0.08±0.04 to 0.15±0.11 (p < 0.001). The simulated visual acuity under varied contrast conditions improved from 0.49±0.28 before surgery to 0.91±0.42 at 1 month under daytime (C=100%) and nighttime (C=20%) conditions. Simulated visual acuities improved from 0.34±0.23 before surgery to 0.75±0.35 at 1 month after surgery. For darkroom conditions (C=9%), the simulated visual acuity significantly improved from 0.21±0.12 before surgery to 0.47±0.27 at 1 month after surgery.
Conclusions: Posterior capsulotomy using Nd: YAG laser showed improvement in visual and optical qualities. It facilitated the objective assessment of improvements in visual acuity and a better understanding of visual function in patients.
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KEYWORD
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Posterior capsular opacity, Ocular scatter index, OQAS, Simulated visual acuity, Visual quality
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