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

Zeng, Jun; Lan, Gongpu; Zhu, Min; Sun, Kai; Shi, Qun; Ma, Guangfu; Liu, Quan

doi:10.21037/atm-21-2367

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…12 The trefoil also increased postoperatively in all 3 groups, which could be explained by the uneven reconstruction and distribution of the epithelium, therefore inducing the abnormal curvature and trefoil. 25,26 There was a significant difference in the incidence of induced HOAs, spherical aberration, and coma among the 3 groups ( P < .001), with enhanced clinical outcomes of SMILE for astigmatism correction.…”

Section: Discussionmentioning

confidence: 96%

Comparison of myopic astigmatic correction after cross-assisted SMILE, FS-LASIK, and transPRK

Yang,

Li,

et al. 2023

J Cataract Refract Surg

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Purpose: To compare astigmatic correction among cross-assisted small incision lenticule extraction (SMILE), femtosecond laser-assisted in situ keratomileusis (FS-LASIK), and transepithelial photorefractive keratectomy (T-PRK). Setting: The Eye Hospital of Wenzhou Medical University, Zhejiang, China. Design: Prospective comparison study. Methods: This study included 154 right eyes of 154 patients with astigmatism of -1.00 to -2.75 diopters (D). 64, 42, and 48 eyes were receiving SMILE, FS-LASIK, and T-PRK, respectively. The SMILE group used cross-axis alignment for head positioning for astigmatism correction. In the FS-LASIK and T-PRK groups, static and dynamic cyclotorsion control were used. Changes in ocular parameters and vector analysis were assessed six months postoperatively. Results: The safety and efficacy indices were comparable among the three groups six months after surgery. Residual astigmatism was smallest in the SMILE group (-0.23±0.25 D) compared to that in FS-LASIK (-0.40±0.28 D, P = 0.009) and T-PRK groups (-0.42±0.32 D, P = 0.001). Respectively, 53 (82.8%), 36 (85.7%), and 37 (77.1%) eyes achieved an angle of error within ±5° (P = 0.55). Notably, vector analysis showed that the difference vector, the magnitude of the error, and its absolute value were significantly smaller in the SMILE group than those in the other groups (P < 0.05). Additionally, the higher-order aberrations, especially coma, were significantly induced after surgery in each group (P < 0.001). Conclusions: Residual astigmatism magnitude was smallest by cross-assisted SMILE, followed by FS-LASIK and T-PRK, and the astigmatism axial correction was comparable among groups.

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Section: Discussionmentioning

confidence: 96%

Comparison of myopic astigmatic correction after cross-assisted SMILE, FS-LASIK, and transPRK

Yang,

Li,

et al. 2023

J Cataract Refract Surg

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“…Understanding of the human ocular refractive system is constantly improving with the rapid development of physical optics. In particular, higher order aberration (HOA) has enhanced the study of visual quality [12][13][14] and has become an important index in research on refractive surgery. Spherical-like aberration or LSA is a higher order aberration with significant impact on visual quality.…”

Section: Discussionmentioning

confidence: 99%

Analysis of Asphericity and Corneal Longitudinal Spherical Aberration of 915 Chinese Myopic Adult Eyes

Zhang¹,

Li²,

Zhang³

et al. 2023

OPTH

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To analyze the corneal asphericity, longitudinal spherical aberration (LSA), and related factors in Chinese myopic adult eyes. Methods: This was a retrospective study of myopic adult patients. The corneal asphericity and LSA were measured at 3.0, 4.0, 5.0, 6.0, and 7.0 mm diameter apertures using corneal tomography. Age and refractive power were recorded for correlation analysis. Results: In total, 531 females and 384 males were included. At the above five diameter settings the corneal asphericity values (Q) of the anterior surface were −0.09±0.21, −0.14±0.16, −0.15±0.13, −0.17±0.11, and −0.20±0.11, and those of the posterior surface were 0.23±0.49, 0.06±0.29, −0.01±0.22, −0.07±0.16, and −0.08±0.15, respectively. The anterior corneal LSA values at these diameters were 0.39±0.19, 0.63±0.27, 0.97±0.36, 0.90±0.30, and 0.83±0.29 D, respectively and the whole corneal values were 0.26±0.20, 0.44±0.27, 0.70±0.36, 0.66±0.30, and 0.59±0.28 D, respectively. Corneal asphericity and peripheral LSA showed no or weak correlation with age or spherical equivalent (all r < 0.2). Conclusion: Corneal anterior and posterior Q values in myopia patients are negatively correlated with corneal diameter. Corneal anterior and whole corneal LSA increased significantly with diameter up to 5 mm, then decreased slightly with diameter. Corneal asphericity and peripheral LSA showed very weak or no correlation with age or spherical equivalent. Clinical Trial Registration Number: ChiCTR1800015985.

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“…In addition, CCT have been relied on to design the ablation zone diameters, which is closely related to postoperative visual quality. For example, a smaller ablation zone diameter normally results in an increase corneal HOAs 9 , which is associated with lower visual quality postoperatively. In our study, an apparent increase in CCT was found, and this increase showed the potential significant errors in preoperative planning, which is not only concerned screening the risk of postoperative corneal keratectasia, but also the evaluation of postoperative visual quality for LASIK 10 .…”

Section: Discussionmentioning

confidence: 99%

Effect of sodium fluorescein strip application on cornea parameters commonly used in laser-assisted in-situ keratomileusis

Han,

Xie,

Yuan

et al. 2023

Sci Rep

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To assess the effect of sodium fluorescein (NaF) strip on corneal parameters commonly used in Laser-assisted in-situ keratomileusis (LASIK). Eighty-six subjects (172 eyes) scheduled for LASIK were recruited between January and March 2022. The study and statistical analysis test were conducted in April 2022. Topographic measurements of corneal parameters, including central corneal thickness (CCT), anterior keratometric (K) readings (K1, flat keratometry; K2, steep keratometry), horizontal corneal diameter (white to white, WTW), and corneal asphericity (Q value), were obtained using a Scheimpflug device (Pentacam) before and 10 min after NaF strip treatmentThe Pentacam recorded a small significant increase in CCT (mean 538.88 ± 28.78 μm to 547.90 ± 29.94 μm; p < .001), with no differences in K1 and K2 (mean 42.24 ± 1.35D to 42.24 ± 1.35D, and mean 43.34 ± 1.50D to 43.32 ± 1.51D; P > .05, for all) as well as WTW(mean 11.58 ± 0.32 mm to 11.58 ± 0.32 mm, P > .05) before and after NaF strip intervention. Furthermore, there was no significant difference was observed in Q value (mean − 0.30 ± 0.13 to − 0.30 ± 0.14, P > .05). These results indicate that clinicians should avoid NaF strip application before obtaining precise topographic measurements of cornea parameters using the Pentacam.

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

Cited by 6 publications

References 24 publications

Comparison of myopic astigmatic correction after cross-assisted SMILE, FS-LASIK, and transPRK

Comparison of myopic astigmatic correction after cross-assisted SMILE, FS-LASIK, and transPRK

Analysis of Asphericity and Corneal Longitudinal Spherical Aberration of 915 Chinese Myopic Adult Eyes

Effect of sodium fluorescein strip application on cornea parameters commonly used in laser-assisted in-situ keratomileusis

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