Effect of Simple Myopic Astigmatism and Its Axis on Near Visual Performance for Thai Alphabet in Pseudophakic Eyes.

Clinical ophthalmology (Auckland, N.Z.) Pub Date : 2024-12-17 eCollection Date: 2024-01-01 DOI:10.2147/OPTH.S485353
Pakpum Pakviwat, Chureeporn Moollaong, Sasinut Borvonshivabhumi, Vatookarn Roongpoovapatr
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Abstract

Background: Refractive target of low simple myopic astigmatism allows increased depth-of-focus and near visual performance in monofocal intraocular lens (IOL) implants. This study investigated the effect of astigmatism and its axis on distance and near visual acuity (VA), and near visual performance for the Thai alphabet using the Thai MNREAD chart.

Design: Investigational simulation.

Methods: Distance (6.0 m) VA, near (40 cm) VA and near visual performance (maximum reading speed [MRS], threshold print size [TPS] and reading acuity [RA]), were assessed by the Thai MNREAD chart monocularly in 31 pseudophakic eyes (62.8 ± 8.55 years). Six refractive conditions were simulated using trial lenses: ±0.00 DS [in-focus at distance], +1.00 × 90 [ATR (Against-the-Rule)], +2.00 × 90 [ATR], +1.00 × 180 [WTR (With-the-Rule)], +2.00 × 180 [WTR], and +3.00 DS [in-focus at near].

Results: Distance VA was degraded by spherical and astigmatic defocus compared with +0.00 DS [in-focus (distance)] (p < 0.001). No significant difference in distance VA was found between ATR and WTR astigmatism at the same magnitude. Near VA was better with +3.00 DS (p-value < 0.001) compared with other refractive conditions. Near visual performance (threshold print size [TPS]) was significantly better in ATR compared with WTR astigmatism (p <0.001 for both +1.00 DC and 2.00 DC).

Conclusion: Low simple myopic astigmatism improved near visual performance in monofocal IOL implants at the expense of degradation of distance VA. ATR astigmatism provided better TPS than WTR astigmatism. This benefit of ATR over WTR astigmatism on reading performance on the Thai alphabet confirmed the role of axis orientation on near visual performance.

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单纯近视散光及其轴向对假性眼泰语字母近视性能的影响。
背景:低单纯性近视散光的屈光目标可以增加单焦点人工晶状体(IOL)植入物的焦深和近视力表现。本研究采用泰文MNREAD图表研究了散光及其轴对泰文字母的远近视敏度(VA)和近视性能的影响。设计:研究性模拟。方法:对31只假性晶状眼(62.8±8.55岁),采用泰国MNREAD单眼表评定近距离(6.0 m) VA、近距离(40 cm) VA和近距离视觉表现(最大阅读速度[MRS]、阈值打印尺寸[TPS]和阅读灵敏度[RA])。使用试验透镜模拟了6种折射条件:±0.00 DS[远距聚焦]、+1.00 × 90[反规则)]、+2.00 × 90 [ATR]、+1.00 × 180[顺规则)]、+2.00 × 180[顺规则)和+3.00 DS[近距离聚焦]。结果:与+0.00 DS[焦内(距离)]相比,球面和散光离焦降低了距离VA (p < 0.001)。在相同星等下,ATR和WTR的散光距离VA无显著差异。近VA较其他屈光条件好,DS为+3.00 (p值< 0.001)。与WTR散光相比,ATR散光的近视性能(阈值打印尺寸[TPS])明显优于WTR散光(p)。结论:低单纯性近视散光以降低距离VA为代价改善了单焦点IOL植入物的近视性能,ATR散光的TPS优于WTR散光。ATR相对于WTR散光在阅读泰文字母方面的优势证实了轴向对近视表现的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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