Effect of astigmatism and spherical equivalent correction on contrast sensitivity.

IF 1.9 4区医学 Q2 OPHTHALMOLOGY International journal of ophthalmology Pub Date : 2024-12-18 eCollection Date: 2024-01-01 DOI:10.18240/ijo.2024.12.12

Maryam Saffarizadeh, Saeed Rahmani, Alireza Akbarzadeh Baghban, Mohammad Ghassemi-Broumand

{"title":"Effect of astigmatism and spherical equivalent correction on contrast sensitivity.","authors":"Maryam Saffarizadeh, Saeed Rahmani, Alireza Akbarzadeh Baghban, Mohammad Ghassemi-Broumand","doi":"10.18240/ijo.2024.12.12","DOIUrl":null,"url":null,"abstract":"Aim: To investigate the effect of astigmatism and spherical equivalent (SE) correction on contrast sensitivity (CS).Methods: In this cross-sectional study, 103 visually normal subjects aged 18 to 36y with bilateral regular astigmatism in range of 1.00 diopter cylinder (DC) to 4.00 DC and normal best-corrected visual acuity (20/20) were recruited. Binocular CS was assessed by linear sine-wave gratings at 1.5, 3, 6, 12, and 18 cycles per degree (cpd), before correction of astigmatism, after full correction of astigmatism by cylindrical spectacle lenses, and after SE of refractive error. The repeated measures ANOVA and Bonferroni test were used to compare the effects of astigmatism correction on logCS.Results: Totally 39 patients were male and 64 patients were female with the mean age of 28.25±5.38y. The average degree of astigmatism in right and left eye was 2.03±0.83 and 2.10±0.78, respectively. Increases in uncorrected astigmatic power correlated with decreases in the logCS, especially at high spatial frequencies. A statistically significant difference in logCS was found between these three cases: before correction of astigmatism, after SE of refractive error, and after full correction of astigmatism by cylindrical spectacle lenses at all frequencies (P<0.001), except at 18 cpd. At 18 cpd, there was no statistically significant difference between logCS before and after SE of refractive error (P=1.0). Also, there was no statistically significant difference in mean CS between with-the-rule (WTR) and against-the-rule (ATR) astigmatism, before correction of astigmatism, after correction of astigmatism with cylindrical lenses, and after SE of refractive error.Conclusion: Binocular astigmatism defocus decreases CS depending on the degree of astigmatism power; correction of this will improve patent's quality of vision. Although high astigmatism refractive error (more than 2.00 DC) that is fully corrected by cylindrical spectacle lenses doesn't increase the CS to the maximum value, especially at higher spatial frequencies (12 and 18). Also SE refractive error effects on improving CS in low astigmatism power (less than 2.00 DC), especially at lower spatial frequencies.","PeriodicalId":14312,"journal":{"name":"International journal of ophthalmology","volume":"17 12","pages":"2243-2247"},"PeriodicalIF":1.9000,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11589434/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International journal of ophthalmology","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.18240/ijo.2024.12.12","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/1/1 0:00:00","PubModel":"eCollection","JCR":"Q2","JCRName":"OPHTHALMOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

Aim: To investigate the effect of astigmatism and spherical equivalent (SE) correction on contrast sensitivity (CS).

Methods: In this cross-sectional study, 103 visually normal subjects aged 18 to 36y with bilateral regular astigmatism in range of 1.00 diopter cylinder (DC) to 4.00 DC and normal best-corrected visual acuity (20/20) were recruited. Binocular CS was assessed by linear sine-wave gratings at 1.5, 3, 6, 12, and 18 cycles per degree (cpd), before correction of astigmatism, after full correction of astigmatism by cylindrical spectacle lenses, and after SE of refractive error. The repeated measures ANOVA and Bonferroni test were used to compare the effects of astigmatism correction on logCS.

Results: Totally 39 patients were male and 64 patients were female with the mean age of 28.25±5.38y. The average degree of astigmatism in right and left eye was 2.03±0.83 and 2.10±0.78, respectively. Increases in uncorrected astigmatic power correlated with decreases in the logCS, especially at high spatial frequencies. A statistically significant difference in logCS was found between these three cases: before correction of astigmatism, after SE of refractive error, and after full correction of astigmatism by cylindrical spectacle lenses at all frequencies (P<0.001), except at 18 cpd. At 18 cpd, there was no statistically significant difference between logCS before and after SE of refractive error (P=1.0). Also, there was no statistically significant difference in mean CS between with-the-rule (WTR) and against-the-rule (ATR) astigmatism, before correction of astigmatism, after correction of astigmatism with cylindrical lenses, and after SE of refractive error.

Conclusion: Binocular astigmatism defocus decreases CS depending on the degree of astigmatism power; correction of this will improve patent's quality of vision. Although high astigmatism refractive error (more than 2.00 DC) that is fully corrected by cylindrical spectacle lenses doesn't increase the CS to the maximum value, especially at higher spatial frequencies (12 and 18). Also SE refractive error effects on improving CS in low astigmatism power (less than 2.00 DC), especially at lower spatial frequencies.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

散光和球面等效校正对对比灵敏度的影响。

目的：探讨像散和球面等效校正对对比灵敏度的影响。方法：选取18 ~ 36岁视力正常、双侧常规散光1.00 ~ 4.00 DC、最佳矫正视力正常（20/20）的受试者103例。采用线性正弦波光栅在1.5、3、6、12和18周期/度（cpd）下评估双眼CS，分别在散光矫正前、散光完全矫正后和屈光不正SE后进行。采用重复测量方差分析和Bonferroni检验比较散光校正对logCS的影响。结果：男性39例，女性64例，平均年龄28.25±5.38岁。左、右眼平均散光度分别为2.03±0.83、2.10±0.78。未校正的像散功率的增加与logCS的降低相关，特别是在高空间频率下。三种情况下，散光矫正前、屈光不正SE、全频率柱形镜片散光矫正后的logCS差异均有统计学意义（PP=1.0）。顺规散光（WTR）与反规散光（ATR）、散光矫正前、柱面透镜散光矫正后、屈光不正SE后的平均CS差异均无统计学意义。结论：双眼散光离焦使CS随散光度数的增加而降低；对其进行矫正将提高患者的视觉质量。虽然高散光屈光不正（超过2.00 DC）被圆柱形眼镜镜片完全矫正后，CS并没有增加到最大值，特别是在较高的空间频率（12和18）。在低散光功率下（小于2.00 DC），特别是在较低的空间频率下，SE屈光不正对CS的改善也有影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

International journal of ophthalmology Medicine-Ophthalmology

CiteScore

2.50

自引率

7.10%

发文量

3141

审稿时长

4-8 weeks

期刊介绍： · International Journal of Ophthalmology-IJO (English edition) is a global ophthalmological scientific publication and a peer-reviewed open access periodical (ISSN 2222-3959 print, ISSN 2227-4898 online). This journal is sponsored by Chinese Medical Association Xi’an Branch and obtains guidance and support from WHO and ICO (International Council of Ophthalmology). It has been indexed in SCIE, PubMed, PubMed-Central, Chemical Abstracts, Scopus, EMBASE , and DOAJ. IJO JCR IF in 2017 is 1.166. IJO was established in 2008, with editorial office in Xi’an, China. It is a monthly publication. General Scientific Advisors include Prof. Hugh Taylor (President of ICO); Prof.Bruce Spivey (Immediate Past President of ICO); Prof.Mark Tso (Ex-Vice President of ICO) and Prof.Daiming Fan (Academician and Vice President, Chinese Academy of Engineering. International Scientific Advisors include Prof. Serge Resnikoff (WHO Senior Speciatist for Prevention of blindness), Prof. Chi-Chao Chan (National Eye Institute, USA) and Prof. Richard L Abbott (Ex-President of AAO/PAAO) et al. Honorary Editors-in-Chief: Prof. Li-Xin Xie(Academician of Chinese Academy of Engineering/Honorary President of Chinese Ophthalmological Society); Prof. Dennis Lam (President of APAO) and Prof. Xiao-Xin Li (Ex-President of Chinese Ophthalmological Society). Chief Editor: Prof. Xiu-Wen Hu (President of IJO Press). Editors-in-Chief: Prof. Yan-Nian Hui (Ex-Director, Eye Institute of Chinese PLA) and Prof. George Chiou (Founding chief editor of Journal of Ocular Pharmacology & Therapeutics). Associate Editors-in-Chief include: Prof. Ning-Li Wang (President Elect of APAO); Prof. Ke Yao (President of Chinese Ophthalmological Society) ; Prof.William Smiddy (Bascom Palmer Eye instituteUSA) ; Prof.Joel Schuman (President of Association of University Professors of Ophthalmology,USA); Prof.Yizhi Liu (Vice President of Chinese Ophtlalmology Society); Prof.Yu-Sheng Wang (Director of Eye Institute of Chinese PLA); Prof.Ling-Yun Cheng (Director of Ocular Pharmacology, Shiley Eye Center, USA). IJO accepts contributions in English from all over the world. It includes mainly original articles and review articles, both basic and clinical papers. Instruction is Welcome Contribution is Welcome Citation is Welcome Cooperation organization International Council of Ophthalmology(ICO), PubMed, PMC, American Academy of Ophthalmology, Asia-Pacific, Thomson Reuters, The Charlesworth Group, Crossref,Scopus,Publons, DOAJ etc.

期刊最新文献

CORRIGENDUM. CORRIGENDUM. COVID-19's effects on microvascular structure in a healthy retina: an OCTA study. Efficacy and safety of combined Kahook Dual Blade goniotomy with phacoemulsification in Chinese patients with primary open angle glaucoma. Idiopathic uveal effusion syndrome with increased intraocular pressure.