[Influence of corneal curvature and peripheral thickness on tonometry readings].

Q3 Medicine

Vestnik oftalmologii Pub Date : 2024-01-01 DOI:10.17116/oftalma202414002243

A A Antonov, A V Volzhanin, E A Klinicheva, M A Karpilova

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引用次数: 0

Abstract

Purpose: This study investigates the influence of peripheral corneal thickness (PCT) and its curvature on tonometry readings.

Material and methods: The study included 49 patients (49 eyes) who were indicated for glaucoma surgery. Using bidirectional applanation tonometry, the following parameters were obtained: IOPcc, IOPg - intraocular pressure (IOP) corrected for corneal compensation, taken as the most reliable indicator; IOP converted to Goldmann measurement, taken as the result of applanation tonometry, ΔIOP (IOPcc-IOPg), CH and CRF (corneal hysteresis and corneal resistance factor). During corneal topography, the corneal thickness was studied in the center, PCT at 1.5; 2, 3, 4 and 5 mm from the center in four meridians, as well as ΔPCT (PCT 3 mm - PCT 1.5 mm), the curvature of the anterior and posterior surfaces of the cornea and the depth of the anterior chamber. Aberrometry was used to obtain refractometry data and the curvature of the anterior surface of the cornea. The influence of the studied parameters on ΔIOP was evaluated.

Results: ΔIOP correlated with CRF (r= -0.652), CH (r= -0.873), central corneal thickness (r= -0.293), PCT at all distances except 5 mm (r= -0.297; -0.287; -0.302; -0.303), with the strong and weak meridians of the anterior surface of the cornea (r=0.328; r=0.315), with the strong and weak meridians of the posterior surface, as well as the average curvature of the posterior surface (r=0.307; r=0.332; r=0.328). After step-by-step selection of the above parameters for creating a linear regression model for ΔIOP calculation, CH, CRF and PCT_1.5mm remained in the model. The model describes ΔIOP with high accuracy (R²=0.974).

Conclusion: Biomechanical parameters of the cornea are the leading factor of applanation tonometry error. Individual linear dimensions of the cornea (thickness, curvature) have a lesser effect.

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[角膜曲率和周边厚度对眼压测量读数的影响]。

目的：本研究探讨周边角膜厚度（PCT）及其曲率对眼压测量读数的影响：研究对象包括 49 名有青光眼手术指征的患者（49 只眼）。使用双向眼压计获得以下参数：IOPcc、IOPg - 经角膜补偿校正的眼压（IOP），作为最可靠的指标；转换为戈德曼测量法的眼压，作为applanation tonometry的结果；ΔIOP（IOPcc-IOPg）、CH和CRF（角膜滞后和角膜阻力因子）。在角膜地形图检查过程中，研究了角膜中心厚度、距中心 1.5、2、3、4 和 5 毫米四条经线上的 PCT、ΔPCT（PCT 3 毫米 - PCT 1.5 毫米）、角膜前后表面曲率和前房深度。利用像差仪获得屈光度数据和角膜前表面曲率。结果：ΔIOP 与 CRF（r= -0.652）、CH（r= -0.873）、角膜中央厚度（r= -0.293）、除 5 mm 外所有距离的 PCT（r= -0.297；-0.287；-0.302；-0.303）相关。303），与角膜前表面的强弱经线（r=0.328；r=0.315），与角膜后表面的强弱经线以及角膜后表面的平均曲率（r=0.307；r=0.332；r=0.328）。在逐步选择上述参数以创建用于计算ΔIOP 的线性回归模型后，模型中保留了 CH、CRF 和 PCT1.5mm。该模型对 ΔIOP 的描述准确度很高（R2=0.974）：结论：角膜的生物力学参数是造成眼压测量误差的主要因素。结论：角膜的生物力学参数是造成眼压测量误差的主要因素，角膜的单个线性尺寸（厚度、曲率）的影响较小。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Vestnik oftalmologii Medicine-Ophthalmology

CiteScore

0.80

自引率

0.00%

发文量

129

期刊介绍： The journal publishes materials on the diagnosis and treatment of eye diseases, hygiene of vision, prevention of ophthalmic affections, history of Russian ophthalmology, organization of ophthalmological aid to the population, as well as the problems of special equipment. Original scientific articles and surveys on urgent problems of theory and practice of Russian and foreign ophthalmology are published. The journal contains book reviews on ophthalmology, information on the activities of ophthalmologists" scientific societies, chronicle of congresses and conferences.The journal is intended for ophthalmologists and scientific workers dealing with clinical problems of diseases of the eye and physiology of vision.