Distribution of Ocular Anterior and Posterior Segment Lengths Among a Cataract Surgical Population in Shanghai

Qi, Jiao; He, Wenwen; Meng, Jiaqi; Wei, Ling; Qian, Dong−Jin; Lu, Yi; Zhu, Xiangjia

doi:10.3389/fmed.2021.688805

Cited by 6 publications

(13 citation statements)

References 30 publications

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“…Normally, the eyeball grows globally and uniformly with AL increasing. However, as suggested by our previous finding, extreme elongation of the eyeball was mainly due to the extension of the posterior segment ( 22 ). Thus, in eyes with extreme myopia, the LD, as an anterior structure, was not further increased with the eyeball extension.…”

Section: Discussionsupporting

confidence: 61%

“…The positive correlations of WTW and ASL with LD was consistent with our previous finding that toric IOLs rotate more in eyes with larger WTW and longer ASL ( 23 ). One reasonable explanation could be that WTW serves as an indicator of the horizontal diameter of the eyeball, thus representing the horizontal size of the anterior segment to a certain extent ( 24 ), and ASL has been established to represent the sagittal dimension of the anterior segment ( 22 , 23 ). Based on the above findings, we should pay special attention to the selection of an appropriate IOL in the clinical management of patients with these characteristics to avoid postoperative IOL decentration, tilt and rotation.…”

Section: Discussionmentioning

confidence: 99%

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The relationships between lens diameter and ocular biometric parameters: an ultrasound biomicroscopy-based study

Huang,

Qi,

Cheng

et al. 2024

Front. Med.

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PurposeThis study aims to explore the relationships between lens diameter (LD) measured with ultrasound biomicroscopy (UBM) and ocular biometric parameters.MethodsOcular biometric parameters including axial length (AL), white-to-white distance (WTW), anterior chamber depth (ACD), lens thickness (LT) and anterior segment length (ASL) were measured with IOL-Master 700, and the direct measurement of LD was conducted through UBM (ArcScan Insight 100). Relationships between LD and ocular biometric parameters were then investigated. Eyes with AL ≥ 28 mm were defined as eyes with extreme myopia, and eyes with AL < 28 mm were defined as eyes without extreme myopia.ResultsA total of 194 eyes from 194 subjects were included. The mean LD was 9.58 ± 0.49 mm, ranging from 8.60 to 10.96 mm. According to univariate analysis, larger LD was associated with elder age, male gender, larger WTW, ACD and ASL (all p < 0.05). Meanwhile, the LD was positively correlated with AL in eyes without extreme myopia (p < 0.05), but not in eyes with extreme myopia (p > 0.05). Backward stepwise regressions revealed that a larger LD was associated with larger WTW, ASL and AL in eyes without extreme myopia (all p < 0.05), while ASL was the only significant variable in eyes with extreme myopia (p < 0.05).ConclusionLarger WTW, ASL and AL in eyes without extreme myopia, as well as longer ASL in eyes with extreme myopia indicated a larger LD, which provides guidance in personalized surgical choice and promises ideal visual outcomes.

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Section: Discussionsupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

The relationships between lens diameter and ocular biometric parameters: an ultrasound biomicroscopy-based study

Huang,

Qi,

Cheng

et al. 2024

Front. Med.

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“…Our findings revealed that the distribution of the AL and the calculated ASL and PSL values align with previous studies conducted among East Asian populations. The mean ASL was 7.58 ± 0.39 mm and the mean PSL was 17.12 ± 2.64 mm in a cataractous population in Shanghai [3]. This consistency suggests that the myopic population in Northern China shares biometric characteristics with other East Asian cohorts.…”

Section: Discussionmentioning

confidence: 69%

“…This study underscores the importance of considering both the AL and PSL while comprehending the progression of myopia. In the field of cataracts, research by Qi et al revealed that a longer ASL and a shorter PSL were associated with older age and the male gender, and the PSL correlated positively with the AL across the study population, indicating the importance of the PSL in the biometric assessment of cataractous eyes [3]. In the work of Jian et al, it was found that eyes that are more keratoconic may have a shorter AL and PSL but a deeper ACD [10].…”

Section: Introductionmentioning

confidence: 99%

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Ocular Biometry Features and Their Relationship with Anterior and Posterior Segment Lengths among a Myopia Population in Northern China

Bian,

Li,

Qin

et al. 2024

JCM

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Objectives: The study aims to explore the ocular biometry of a myopic population in Northern China, focusing specifically on anterior and posterior segment lengths. Methods: This is a cross-sectional study. The medical records of 3458 myopic patients who underwent refractive surgery were evaluated. Axial length (AL), anterior chamber depth (ACD), lens thickness (LT) and other biometric parameters were measured using the IOL Master 700. The study determined the anterior segment length (ASL = ACD + LT), the posterior segment length (PSL = AL − ASL) and the ratio of ASL to PSL (ASL/PSL). Results: This study included 3458 eyes from 3458 myopic patients (1171 men and 2287 women). The mean age was 27.38 ± 6.88, ranging from 16 to 48 years old. The mean ASL was 7.35 ± 0.27 mm, and the mean PSL was 18.39 ± 1.18 mm. The ASL and PSL trends demonstrate an age-related increase for both genders, with notable gender-specific variations. Across most age groups, males typically exhibited higher ASLs and PSLs than females, with the exception of the 35–40 and 40–45 age groups. The ASL and PSL consistently increased with a rising AL. The AL strongly correlates with the PSL and negatively correlates with the ASL/PSL ratio. The ACD and LT moderately correlate with the ASL, but an increased LT does not imply a longer posterior segment. The CCT and SE show little correlation with axial eye parameters. Conclusions: Among Chinese myopic patients, a longer ASL and PSL were correlated with older age and the male gender. The AL strongly correlates positively with the PSL and negatively correlates with the ASL/PSL ratio. An elongation of the posterior segment may primarily account for an eyeball’s lengthening.

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Biometric description of 34 589 eyes undergoing cataract surgery: sex differences

Jiménez-García,

Segura-Calvo,

Puzo

et al. 2024

J Cataract Refract Surg

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Purpose To describe gender differences in the biometric parameters of a large sample of cataract patients. Cataract surgery has evolved from a vision restoration to a refractive procedure, and population-based studies are vital to optimise normative databases and post-surgical outcomes. Setting Miguel Servet University Hospital, Zaragoza, Spain. Design Retrospective single-centre observational study. Methods The study included 34589 eyes (20004 cataract patients). Biometric data was obtained from IOL Master 700 and Pentacam HR. Linear mixed models were used to account for inter-eye correlation. HofferQST formula was used to calculate the hypothetical distribution of IOL power (arbitrary lens; A=119.2). Results Most biometric variables showed significant differences between sexes (p<0.0001), such as 0.53mm shorter eyes found in females, of which 0.16mm are explained by shorter aqueous depth. Steeper anterior keratometries (∼0.75D) were found in females, to end up in no difference on anterior astigmatism magnitude, but different orientation (p<0.0001). The distribution of IOL power differed between sexes (p<0.001), with the interquartile range shifting one dioptre towards more powerful lenses in females and odds ratio (power>26D) = 2.26, p<0.0001 (Fisher’s). Conclusions Large sample size studies provide smaller margin of error, higher power, and controlled risk of reporting false (negative or positive) findings. Highly significant differences between sexes in ocular biometry were found; this supports the idea that including sex as a parameter in IOL calculation should be explored and may improve results. Additionally, the distribution of IOL powers was provided, which may be useful for manufacturers and hospital stock planning.

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Distribution of Ocular Anterior and Posterior Segment Lengths Among a Cataract Surgical Population in Shanghai

Cited by 6 publications

References 30 publications

The relationships between lens diameter and ocular biometric parameters: an ultrasound biomicroscopy-based study

The relationships between lens diameter and ocular biometric parameters: an ultrasound biomicroscopy-based study

Ocular Biometry Features and Their Relationship with Anterior and Posterior Segment Lengths among a Myopia Population in Northern China

Biometric description of 34 589 eyes undergoing cataract surgery: sex differences

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