Effect of corneal biomechanical properties on surgically-induced astigmatism and higher-order aberrations after cataract surgery

Koç, Mustafa; İlhan, Çağrı; Koban, Yaran; Özülken, Kemal; Durukan, İrfan; Yılmazbaş, Pelin

doi:10.5935/0004-2749.20160108

Cited by 13 publications

(8 citation statements)

References 16 publications

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“…Furthermore, some patients who underwent cataract surgery were included. The effect of cataract surgery on corneal shapes cannot been completely ruled out, [30][31][32] even though these changes are temporary based on several reports. [33][34][35] In conclusion, in GCD eyes, except for a slight increase in the posterior components of GCD2 based on a subtype analysis, none of the components differed from the control, and BCVA was not signi cantly associated with these components.…”

Section: Discussionmentioning

confidence: 99%

Corneal Irregular Astigmatism And Visual Function On Anterior Segment Optical Coherence Tomography In TGFBI Corneal Dystrophy

Abe

Fujishiro

Kitamoto

et al. 2022

Preprint

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The purpose of this study was to evaluate corneal irregular astigmatism of patients with granular and lattice corneal dystrophy (GCD and LCD). 70 GCD, 35 LCD, and 23 control eyes were included. Anterior and posterior corneal topographic data obtained from anterior segment optical coherence tomography were expanded into four components via Fourier harmonic analysis. These components were compared with healthy eyes and the association between each component and best-corrected visual acuity (BCVA) was investigated. Anterior and posterior components increased in LCD eyes, but none increased in GCD. Posterior components of GCD type 2 (GCD2), anterior and posterior of LCD type 1 (LCD1), posterior of LCD type IIIA (LCD 3A) and type IV (LCD4) significantly increased. BCVA was significantly associated with anterior and posterior components in LCD eyes but not in GCD. The anterior components of LCD1, anterior and posterior of LCD3A, and posterior of LCD4, but not the posterior of LCD3A, were positively correlated with BCVA. As conclusions, in GCD eyes, none of the components differed from those of the control and BCVA was not significantly associated with them. In LCD eyes, the anterior and posterior components increased, and BCVA was significantly associated with the anterior and posterior components.

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Section: Discussionmentioning

confidence: 99%

Corneal Irregular Astigmatism And Visual Function On Anterior Segment Optical Coherence Tomography In TGFBI Corneal Dystrophy

Abe

Fujishiro

Kitamoto

et al. 2022

Preprint

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“…In this study we observed a significant difference in SIA depending on the proximity of a 2.4-mm corneal incision to the steep axis of preoperative astigmatism. In spite of conflicting data on the extent of SIA in cataract surgery, the incision size has repeatedly been confirmed as the single most important contributing factor: While Kurz et al [20] reported a SIA of 0.31D associated with an incision size of 2.75 mm, others described a SIA of 0.76 D and 0.74 D at 2.8 mm and 2.84 mm incision size, respectively, in a central 6.0mm zone [18,21]. These study groups described SIA irrespective of the incisional relation to the axis of SIA and coupling effect after CPS K original article Fig.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast to previous studies [18,20,21], we employed a stricter methodical approach to observe the change in corneal astigmatism by using the measurement of the central 3.00-mm zone, where the corneal astigmatism is clinically more relevant [22].…”

Section: Discussionmentioning

confidence: 99%

Surgically induced astigmatism and coupling effect-mediated keratometric changes after conventional phacoemulsification cataract surgery

Angermann

Palme

Segnitz

et al. 2021

Spektrum Augenheilkd.

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Summary Background The aim of the present study was to describe surgically induced astigmatism (SIA) and the coupling effect after conventional phacoemulsification cataract surgery (CPS) in relation to the incisional axis. Material and methods A total of 42 patients were included in the retrospective case series study. Corneal topography was obtained for patients with significant cataract before and 6 weeks after CPS with a main clear corneal incision size of 2.4 mm. Patients were grouped according to the relationship of the incisional axis to the position of the steep axis into a steep incisional group and a flat incisional group. Results In total, 46 eyes were included in the study. While the steep incisional group showed an SIA of −0.15 D (± 0.35), the flat incisional group had a significantly higher SIA of 0.20 D (± 0.51) (p = 0.03). The coupling ratio (CR) in the steep incisional group was −0.38 (± 1.41) and in the flat incisional group it was 0.16 (± 0.97). Correspondingly, a coupling constant (CC) of −0.25 was found for group 1 and a CC of 0.0 for group 2. Conclusion Our results suggest that the location of the main incision should be decided with consideration of the corneal astigmatism in order to minimize the SIA. The CR helps to understand the effect of induced astigmatism and the change in spherical equivalent.

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“…Koc et al . also was able to demonstrate a significant correlation between CH and spherical aberration in healthy patients after cataract surgery [19].…”

Section: Discussionmentioning

confidence: 99%

Corneal topometric, aberrometric and biomechanical parameters in mucopolysaccharidosis patients

et al. 2019

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Aims To report corneal topometric and aberrometric values in mucopolysaccharidosis (MPS) and to investigate their correlation with biomechanical corneal parameters. Methods One randomly chosen eye of 20 MPS patients with no to moderate corneal clouding and one eye of 23 healthy controls with comparable age were prospectively included into this study. Corneal surface regularity was assessed by index of surface variance (ISV), -vertical asymmetry (IVA), -height asymmetry (IHA), -height decentration (IHD); keratoconus index (KI), central keratoconus index (CKI) and Zernike indices of anterior and posterior corneal surface using Scheimpflug imaging (Pentacam). Corneal resistance factor (CRF) and corneal hysteresis (CH) were assessed by Ocular Response Analyzer. Statistical analyses were performed using Mann-Whitney-Test and Spearman Correlation Coefficients. Results IVA, ISV, IHD, IHA, but not KI and CKI were significantly higher in MPS patients compared to age matched healthy controls. Spherical aberration and asphericity coefficients either at the anterior or at the posterior corneal surface differed significantly between both groups. The grade of the MPS-associated corneal opacity correlated significantly with ISV (rho = 0.52), IVA (rho = 0.54), IHA (rho = 0.57) and IHD (rho = 0.48). Density of the MPS-affected corneas correlated significantly with ISV (rho = 0.52), IVA (rho = 0.72), IHA (rho = 0.57), IHD (rho = 0.69), 3rd order horizontal trefoil aberration at the posterior (rho = 0.62) and anterior surface (rho = 0.48) as well as with CH (rho = 0.55) and CRF (rho = 0.57). Spherical aberration at the back surface correlated with CRF and CH in MPS and in healthy controls. Conclusions This is the first study analyzing shape of the corneal surface in MPS patients. Topometric indices of corneal asymmetry are significantly increased and correlate with MPS-related corneal opacity and density. Spherical aberration and asphericity coefficient at the front and at the back corneal surface differ significantly between MPS and healthy controls.

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Effect of corneal biomechanical properties on surgically-induced astigmatism and higher-order aberrations after cataract surgery

Cited by 13 publications

References 16 publications

Corneal Irregular Astigmatism And Visual Function On Anterior Segment Optical Coherence Tomography In TGFBI Corneal Dystrophy

Corneal Irregular Astigmatism And Visual Function On Anterior Segment Optical Coherence Tomography In TGFBI Corneal Dystrophy

Surgically induced astigmatism and coupling effect-mediated keratometric changes after conventional phacoemulsification cataract surgery

Corneal topometric, aberrometric and biomechanical parameters in mucopolysaccharidosis patients

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