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Graefe's Archive for Clinical and Experimental Ophthalmology

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23.10.2019 | Refractive Surgery

Optical quality in low astigmatic eyes with or without cylindrical correction

verfasst von: Qing-Qing Tan, Bai-Wei Wen, Xuan Liao, Jing Tian, Jia Lin, Chang-Jun Lan

Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology | Ausgabe 2/2020

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Abstract

Purpose

To investigate whether optical quality could be improved by cylindrical correction for low astigmatic eyes with different amounts and axis orientations in patients with myopia up to − 3.00 diopters (D).

Methods

A cross-sectional study enrolling healthy young eyes with 0 to − 3.00 D myopia and − 0.50 to − 0.75 D myopic astigmatism was implemented. With a repeated-measures design, outcome measures were sequentially obtained for each subject under two correction modalities: spherocylindrical correction and spherical correction. Subjective refraction was used to determine the refractive prescriptions accordingly in the two correction modalities to obtain optimal subject-reported visual acuity. Primary outcomes were optical quality parameters including objective scatter index (OSI), modulation transfer function (MTF) cut-off, Strehl ratio (SR), and a simulated contrast visual acuity-optical quality analysis system (OQAS) values (OV) obtained by a double-pass system. Corrected distance visual acuity (CDVA) was measured as a secondary outcome. Outcome comparisons between the two correction modalities were performed by grouping in different amounts (− 0.50 D, − 0.75 D) and axes (with the rule, WTR; against the rule, ATR; oblique, OBL) of astigmatism.

Results

A total of 194 eyes of 194 subjects were evaluated. Significantly better CDVA were shown by spherocylindrical correction for all types of astigmatism except for − 0.50 D WTR astigmatism (P = 0.831). For eyes with − 0.50 D WTR astigmatism, better outcome was only shown in OSI with spherocylindrical correction (P = 0.019). For eyes with − 0.50 D ATR and OBL astigmatism, spherocylindrical correction demonstrated better outcomes in all parameters except for SR (P > 0.05). For eyes with − 0.75 D astigmatism, significantly better outcomes in all optical quality parameters were shown with spherocylindrical correction regardless of the axis (P < 0.05).

Conclusions

Eyes with ATR or OBL myopic astigmatism may benefit in optical quality and visual acuity by combining a cylindrical correction even with a low amount down to − 0.50 D. However, optical quality and visual acuity improvement are limited for WTR astigmatic eyes when the amount of astigmatism is less than − 0.75 D.

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Titel: Optical quality in low astigmatic eyes with or without cylindrical correction
verfasst von: Qing-Qing Tan
Bai-Wei Wen
Xuan Liao
Jing Tian
Jia Lin
Chang-Jun Lan
Publikationsdatum: 23.10.2019
Verlag: Springer Berlin Heidelberg
Erschienen in: Graefe's Archive for Clinical and Experimental Ophthalmology / Ausgabe 2/2020
Print ISSN: 0721-832X
Elektronische ISSN: 1435-702X
DOI: https://doi.org/10.1007/s00417-019-04501-0

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Optical quality in low astigmatic eyes with or without cylindrical correction

Abstract

Purpose

Methods

Results

Conclusions

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Operative Therapie und Keimnachweis bei endogener Endophthalmitis

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Springer Medizin

Abstract

Purpose

Methods

Results

Conclusions

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