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BMC Ophthalmology

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Open Access 01-12-2020 | Coma | Research article

Characteristics of corneal high-order aberrations in adolescents with mild to moderate myopia

Authors: Xu Zhang, Jin-Hui Ma, Xin Xi, Lin Guan

Published in: BMC Ophthalmology | Issue 1/2020

Abstract

Background

This study investigated the characteristics of corneal higher-order aberrations (HOAs) of the anterior surface, posterior surface, and total cornea in adolescents with mild to moderate myopia.

Methods

A total of 183 patients with myopia (183 eyes) aged 8 to 18 years were enrolled in this study. The axial length (AL) of the eyes was measured by an IOL-Master, and corneal curvatures (K-values) and HOAs were measured by a Pentacam anterior segment diagnostic analyzer.

Results

Results of this study showed that the anterior, posterior and total corneal horizontal coma Z₃¹ were − 0.1249 ± 0.105 μm, 0.0009 ± 0.001 μm, and − 0.1331 ± 0.116 μm, respectively; the anterior, posterior and total corneal vertical coma Z₃^− 1 were − 0.0212 ± 0.164 μm, 0.0003 ± 0.043 μm, and − 0.0216 ± 0.168 μm, respectively; and spherical aberration (SA) Z₄⁰ values were 0.2244 ± 0.091 μm, 0.1437 ± 0.029 um, and 0.1889 ± 0.090 μm, respectively. Total corneal Z₃¹ was statistically correlated with posterior corneal astigmatism (K₂b − K₁b) (p = 0.038). Total corneal Z₃^− 1 was correlated with anterior corneal astigmatism (K₂f − K₁f) (p = 0.027). Anterior, posterior, and total corneal Z₄⁰ were correlated with anterior and posterior corneal curvature (K₁f, K₂f, K₁b, K₂b) (p = 0.001). Posterior corneal Z₄⁰b was also significantly correlated with AL.

Conclusions

In adolescents with mild to moderate myopia, the posterior corneal surface shape may play a compensatory role in the balance of corneal aberrations, and the posterior corneal SA tended to become less negative as the AL increased. The corneal coma may also play a compensatory role in posterior corneal surface astigmatism, which was valuable for the treatment for improving visual quality. This conclusion still needs to be verified.

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Title: Characteristics of corneal high-order aberrations in adolescents with mild to moderate myopia
Authors: Xu Zhang
Jin-Hui Ma
Xin Xi
Lin Guan
Publication date: 01-12-2020
Publisher: BioMed Central
Keyword: Coma
Published in: BMC Ophthalmology / Issue 1/2020
Electronic ISSN: 1471-2415
DOI: https://doi.org/10.1186/s12886-020-01727-z

At a glance: The STEP trials

Springer Medicine

Characteristics of corneal high-order aberrations in adolescents with mild to moderate myopia

Abstract

Background

Methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Background

Methods

Results

Conclusions

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