Changes of corneal high-order aberrations after femtosecond laser-assisted in situ keratomileusis

Wang, Jing; Ren, Yanlin; Liang, Kun; Jiang, Zhengxuan; Tao, Liming

doi:10.1097/md.0000000000010618

Cited by 20 publications

(24 citation statements)

References 29 publications

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“…The prevention and control of adolescent myopia are of global importance because of its high burden on vision health. Some scholars believe that the decline in retinal imaging quality caused by high-order aberrations (HOAs) may be a factor that influences the development of myopia in children [3][4][5][6][7]. In a study conducted by Zhang et al, HOA without spherical aberration (SA) was correlated with the progression of myopia [4], and it was predicted that HOA is a risk factor for myopia progression.…”

Section: Introductionmentioning

confidence: 99%

“…Animal studies showed that a form of deprivation or lens-induced blur can induce myopia by degrading the quality of the retinal image [ 5 ]. Wang et al [ 6 ] suggested that HOAs may be a cause of accommodative anomalies, while Kirwan et al [ 7 ] found that myopic eyes have more HOAs than emmetropic eyes. However, Cheng et al [ 8 ] found no correlation between refractive error diopter and either SA or HOAs.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

et al. 2020

BMC Ophthalmol

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Zhang

et al. 2020

BMC Ophthalmol

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“…After surgery, CCT and spherical diopter were associated with spherical aberration, coma, trefoil, and astigmatism. Previous studies have shown that spherical aberration and coma have major effects on visual function (15,22). Therefore, we conclude that CCT and spherical diopter are closely related to postoperative visual quality, which may help us to predict the postoperative visual quality of patients.…”

Section: Discussionmentioning

confidence: 52%

“…As a dominant structure in determining the refractive power of the eye, the cornea was found to be a critical contributor to wavefront aberrations in the whole eye (12)(13)(14). Changes in corneal aberration after FS-LASIK surgery may have a significant effect on visual quality (15). Corneal high-order optical aberration has been found to be linked to contrast visual acuity, image quality, night myopia, and photic complaints (16).…”

Section: Introductionmentioning

confidence: 99%

Factors associated with corneal high-order aberrations before and after femtosecond laser-assisted in situ keratomileusis

Zeng¹,

Lan²,

Zhu³

et al. 2021

Ann Transl Med

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Background: Corneal high-order aberrations (HOAs) are related to visual quality. However, the factors associated with corneal HOAs before and after femtosecond laser-assisted in situ keratomileusis (FS-LASIK)have not yet been elucidated. The aim of this study is to observe the factors related to corneal HOAs before and after FS-LASIK.Methods: Prospective observational study was designed to measure corneal HOAs in 149 eyes of 75 patients before and 6 months after FS-LASIK. The relationship between spherical diopter and corneal parameters, including K1 and K2 (horizontal and vertical refractive power of the cornea, respectively), the aspheric characteristics of the cornea (Q), mean radius of the curvature of the cornea (Rm), and central corneal thickness (CCT), with corneal HOAs were analyzed. Results:The spherical diopter was correlated with trefoil at 30° before surgery and with vertical coma, four-order astigmatism at 0°, trefoil at 30°, spherical aberration, and six-order spherical aberration after surgery (P<0.05). CCT was correlated with vertical coma, four-order astigmatism at 0°, trefoil at 30°, and sixorder spherical aberration after surgery (P<0.05). K1 was correlated with spherical aberration and six-order astigmatism at 0° before surgery (P<0.05). K2 was correlated with spherical aberration, six-order astigmatism at 45°, astigmatism at 0°, six-order astigmatism at 0° before surgery, and trefoil at 30° after surgery (P<0.05).Q was correlated with spherical aberration, six-order spherical aberration, and six-order astigmatism at 45° (P<0.05). Rm was correlated with six-order astigmatism at 0°, spherical aberration, six-order astigmatism at 45° before surgery, and astigmatism at 0° after surgery (P<0.05) Conclusions: Corneal parameters and spherical diopter are related to the HOAs of the cornea before and after FS-LASIK.

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“…2,3 With the advancement in diagnostic techniques and precise corrections of corneal aberrations with lasers, the HOAs have been at the center stage of research for improving the efficiency of the ocular system. [4][5][6][7][8][9][10] There is currently no gold standard modality for the evaluation of corneal aberrations. 11 Nevertheless, the widespread use of corneal topographers is permitting researchers and clinicians to explore the corneal changes associated with refractive errors.…”

Section: Introductionmentioning

confidence: 99%

<p>Inter-Ocular Asymmetry in Anterior Corneal Aberrations Using Placido Disk-Based Topography</p>

Alzaben¹,

Gammoh²,

Freixas³

et al. 2020

OPTH

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Inter-ocular asymmetry in anterior corneal high-order aberrations has previously not been investigated. This study aims to investigate the normal range of inter-ocular asymmetry in corneal high-order aberrations (HOAs) using a Placido disk-based corneal topographer to explore the relationship between the HOA parameters of the anterior corneal for each eye individually and the refractive error. Patients and Methods: A total of 257 subjects (98 males and 159 females) were participated, with an age range of 6 to 81 years (average of 40.2 ±17.53). Participants were divided into three groups: myopia (spherical equivalent (SEQ) of refraction ≥−0.50 D), hypermetropia (SEQ ≥+0.50 D), and emmetropia. For all patients, high-order aberrations were measured using a corneal topographer (CA.200TM; Topcon). Inter-ocular asymmetry was represented by RMS (root mean square) for three, five, and seven mm as pupil entry; aberrations for five mm pupil (vertical and oblique trefoil, vertical and horizontal comma, and primary spherical aberration) were recorded using the instrument's built-in software. Results: Hypermetropes exhibit the highest inter-ocular asymmetry of all RMS values, mostly in spherical aberrations, and higher-order trefoil values. Oblique trefoil aberrations had the highest interocular asymmetry in the myopic groups. The interocular asymmetry in horizontal coma values was the highest in emmetropes and the lowest in hypermetropes. Conclusion: To our knowledge, this is the first observational study of inter-ocular differences in high-order aberrations of the anterior corneal surface of the human eye. This study's results could be used to establish normal values of inter-ocular asymmetry of HOAs of the anterior cornea. The use of such normal values should be investigated further to serve as a guideline for clinicians when establishing the best management route for the patient's refractive error.

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Changes of corneal high-order aberrations after femtosecond laser-assisted in situ keratomileusis

Abstract: After FS-LASIK changes in corneal aberration occurred mainly on the anterior surface, which may have a significant effect on visual quality.

Cited by 20 publications

References 29 publications

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

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

Factors associated with corneal high-order aberrations before and after femtosecond laser-assisted in situ keratomileusis

<p>Inter-Ocular Asymmetry in Anterior Corneal Aberrations Using Placido Disk-Based Topography</p>

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