Anterior Segment Characteristics of Eyes with Anterior Chamber Depth Less than 2.8 mm and Axial Length Greater than 25 mm

Niu, Lingling; Luo, Xiumei; Chen, Xueli; Wang, Xiaoying; Zhou, Xingtao; Qian, Yishan

doi:10.1007/s40123-023-00666-4

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…The primary objective of this study is to explore the impact of myopia on a spectrum of corneal parameters. Prior investigations across diverse populations have indicated potential impairments in the corneal mechanical strength of myopia ( Han et al, 2020 ; Liu et al, 2021 ; Liu Y. et al, 2022 ), alongside variances in ocular biometric traits ( Niu et al, 2023 ). However, inherent individual variations pose challenges to research outcomes.…”

Section: Discussionmentioning

confidence: 99%

Comparative analysis of corneal parameters in simple myopic anisometropia using Scheimpflug technology

Wang,

Chang,

Nan

et al. 2024

Front. Bioeng. Biotechnol.

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PurposeThis study aims to investigate the differences in binocular corneal parameters and their interrelation with binocular biometric parameters asymmetry in patients with simple myopic anisometropia, thereby elucidating the influence of myopia process on various corneal parameters.MethodsIn this cross-sectional study, 65 patients with anisometropia in monocular myopia were included. They were divided into low anisometropia group: 3.00D<Δ spherical equivalent (SE)≤−1.00D (Δ represents the difference between the two eyes, i.e., myopic data minus emmetropic data) and high anisometropia group: ΔSE ≤ −3.00D. Corneal and ocular biometric parameters were measured using Pentacam, Corvis ST, and IOL Master 700. Statistical analyses focused on the binocular corneal parameters asymmetry, using the contralateral emmetropia as a control.ResultsThe mean age of participants was 18.5 ± 1.3 years, with the average SE for myopia and emmetropia being −2.93 ± 1.09D and −0.16 ± 0.41D, respectively. The central corneal thickness (CCT), flat keratometry (Kf), keratometry astigmatism (Ka), total corneal aberration (6 mm) (TOA), surface variance index (ISV), vertical asymmetry index (IVA), stress-strain index (SSI), and first applanation stiffness parameter (SPA1) and ambrosia relational thickness-horizontal (ARTh) showed significant differences between anisometropic fellow eyes (p < 0.05). There were significant differences in ΔIVA, Δ the difference between the mean refractive power of the inferior and superior corneas (I-S), Δ deviation value of Belin/Ambrósio enhanced ectasia display (BAD-D), Δ deformation amplitude ratio max (2 mm) (DAR)and Δ tomographic biomechanical index (TBI) (p < 0.05) in two groups. Asymmetry of corneal parameters was correlated with asymmetry of ocular biometric parameters. Anisometropia (ΔSE) was positively correlated with ΔIVA (r = 0.255, p = 0.040), ΔBAD-D (r = 0.360, p = 0.006), and ΔSSI (r = 0.276, p = 0.039) and negatively correlated with ΔDAR (r = −0.329, p = 0.013) in multiple regression analysis. Δ mean keratometry (Km), Δ anterior chamber depth (ACD), and Δ biomechanically corrected intraocular pressure (bIOP) were also associated with binocular corneal differences.ConclusionCompared to contralateral emmetropia, myopic eyes have thinner corneas and smaller corneal astigmatism. Myopic corneas exhibit relatively more regular surface morphology but are more susceptible to deformation and possess marginally inferior biomechanical properties. In addition, there is a certain correlation between anisometropia and corneal parameter asymmetry, which would be instrumental in predicting the development of myopia.

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Section: Discussionmentioning

confidence: 99%

Comparative analysis of corneal parameters in simple myopic anisometropia using Scheimpflug technology

Wang,

Chang,

Nan

et al. 2024

Front. Bioeng. Biotechnol.

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“…The reliability of the procedure mentioned above has been reported in a previous study. 8 The radial and cross-sectional images at the location of ICL haptics were acquired at 1 and 12 months postoperatively. Only the images with a clear visualization were finally stored and analyzed.…”

Section: Methodsmentioning

confidence: 99%

“…The following parameters were measured (Figure 1, A-C): (1) horizontal and vertical ciliary sulcus-to-sulcus diameter (HSTS and VSTS); (2) lens thickness and STSL (the distance between the STS plane and the anterior crystalline lens surface); (3) trabecular-ciliary angle (TCA): the angle measured by the scleral spur as the apex and the corneal endothelium and the anterior surface of the ciliary body as the arms; (4) iris-ciliary angle (ICA, the angle between the posterior iris surface and the anterior surface of the ciliary body); (5) iris thickness at 500 mm (IT500, iris thickness at 500 mm from the scleral spur); (6) trabecular-ciliary process distance (TCPD, a line extending from the corneal endothelium 500 mm anterior to the scleral spur toward the ciliary processes) and iris-ciliary process distance (ICPD, distance from the posterior iris surface to the ciliary process perpendicular 500 mm from the scleral spur); (7) maximum ciliary body thickness (CBTmax, the distance from the innermost point of the ciliary body to the inner wall of the sclera or its extended line) and ciliary process length (CPlength, the distance from the innermost point of the ciliary process to the intersection point of the iris and ciliary body); (8) the central vault of ICL (perpendicular distance from the posterior surface of ICL to the anterior pole of the lens at the pupil center); and (9) the vertical distance measured from the posterior surface of the iris root to the parallel line passing through the terminal tip of the ICL haptics (iris root to the tip of haptics, IRH). 8,9 For STS and STSL, the average values from the horizontal and vertical directions were obtained for the analysis. For TCA, ICA, IT500, TCPD, ICPD, CBTmax, CPlength, and IRH, the average values from the 4 quadrants were obtained for the analysis.…”

Section: Ubm Measurementsmentioning

confidence: 99%

Risk Factors Associated with Haptic Malposition in Eyes Implanted with Implantable Collamer Lenses

Chang,

Niu,

Zhou

et al. 2023

J Cataract Refract Surg

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Purpose: To examine the risk factors for haptic malposition in eyes with implantable collamer lens (ICL). Setting: Eye and ENT Hospital, Fudan University, Shanghai, China. Design: Prospective non-randomized observational study. Methods: This study included 134 (77.9%) out of 172 initially enrolled patients who underwent ICL implantation and completed a one-year follow-up. The extent of haptic present in the ciliary sulcus (ICS) was measured. Patients were categorized based on ICS count (0-4). The position of the haptic was quantified as the distance between the iris root and the terminal tip of ICL haptic (iris root to haptic tip, IRH). The related factors to the ICS count and its correlation with the central vault were analyzed. Results: ICS distribution was: 0 ICS in 19 eyes (14.2%), 1 in 22 eyes (16.4%), 2 in 32 eyes (23.9%), 3 in 29 eyes (21.6%), and 4 in 32 eyes (23.9%). Parameters like maximum ciliary body thickness (CBTmax, P=0.008), iris ciliary process distance (ICPD, P<0.001), and ciliary process length (CPlength, P=0.034) varied significantly across ICS groups. A multiple linear regression analysis revealed that the iris-ciliary angle (ICA, P=0.006), CBTmax (P=0.007), the distance between the sulcus to sulcus plane and anterior crystalline lens surface (STSL, P=0.035), and ICL size (P=0.015) were significantly associated with IRH. Spherical equivalents (P=0.042), STSL (P=0.001), and ICS count (P=0.020) significantly correlated with the central vault. Conclusions: Shortened ciliary process is a primary risk for haptic malposition. The ICS count significantly relates to the central vault.

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Relationship between smartphone usage in changes of ocular biometry components and refraction among elementary school children

LIWAN,

AKIB,

MUHIDDIN

et al. 2023

Minerva Ophthalmol

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Anterior Segment Characteristics of Eyes with Anterior Chamber Depth Less than 2.8 mm and Axial Length Greater than 25 mm

Cited by 3 publications

References 26 publications

Comparative analysis of corneal parameters in simple myopic anisometropia using Scheimpflug technology

Comparative analysis of corneal parameters in simple myopic anisometropia using Scheimpflug technology

Risk Factors Associated with Haptic Malposition in Eyes Implanted with Implantable Collamer Lenses

Relationship between smartphone usage in changes of ocular biometry components and refraction among elementary school children

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