Pentacam眼前节分析系统在巩膜镜验配初始矢高选择中的应用.

doi:10.3760/cma.j.cn115909-20210913-00382

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Abstract

Objective: To evaluate the value of using the Pentacam anterior segment analyzer to measure ocular

anterior segment parameters in the selection of initial lens sagittal depth (LSD) for scleral lenses (SL).

Methods: Retrospective serial case study. Thirty-two patients (53 eyes) with irregular corneal astigmatism

or dry eye disease were enrolled and fitted with SL in the Affiliated Eye Hospital of Nanjing Medical

University from October 2020 to June 2021. All patients underwent general ophthalmic examinations

before the initial SL fitting evaluation. Pentacam was used to obtain the ocular anterior segment parameters,

such as flat keratometry (Kf), steep keratometry (Ks), corneal astigmatism, aspheric factor (Q-value),

central corneal thickness (CCT), corneal diameter, and anterior chamber depth (ACD). In addition, the

built-in caliper of the Pentacam was used to measure corneal sagittal height (CSH) at a 13.50 mm chord

length. A Pearson or Spearman correlation analysis was used to evaluate the relationship between the

modified LSD and above-mentioned parameters measured by Pentacam, and a linear regression model

was created. Results: All patients completed the first SL fitting evaluation.The CSH measured in the

Scheimpflug images of the Pentacam were 3 746±187 μm under a 13.50 mm chord length, and the modified

LSD was 3 622±206 μm after fitting. The results of a correlation analysis showed that the modified LSD

was positively associated with Kf, Ks, corneal astigmatism, ACD and CSH (r ranged from 0.36 to 0.84, all

P<0.05). The modified LSD was negatively correlated with CCT (r=-0.35, P=0.011). However,there was

no correlation between the Q-value or corneal diameter and the modified LSD. Defining the modified LSD

as a dependent variable, the linear regression model showed that CSH measured by Pentacam was highly

correlated with the modified LSD after correcting for the other covariates. The linear regression equation

is LSD=416.996+0.854×CSH (adjusted R2=0.63, F=89.17, P<0.001). Conclusions: Some ocular anterior

segment parameters measured by Pentacamare correlated with the modified LSD, and CSH can be used as

an important reference for the selection of LSD inthe process of SL fitting.

Key words： scleral lenses Pentacam anterior segment analyzer corneal sagittal height lens sagittal depth

Received: 13 September 2021

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Corresponding Authors: Jinsong Xue, Nanjing Medical University Affiliated Eye Hospital, Nanjing 210029,China (Email: 25068411@qq.com)

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	Shanshan Xu
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Cite this article:

Shanshan Xu,Yan Hu,Yan Qi等. The Application of Pentacam Anterior Segment Analyzer in the Selection of Initial Sagittal Height in Scleral Lens Fitting[J]. Chinese Journal of Optometry Ophthalmology and Visual science, 2022, 24(2): 131-136.

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https://www.cjoovs.com/EN/10.3760/cma.j.cn115909-20210913-00382 OR https://www.cjoovs.com/EN/Y2022/V24/I2/131

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