[Effect of refractive surgery on Maklakov tonometry results].

Q3 Medicine Vestnik oftalmologii Pub Date : 2024-01-01 DOI:10.17116/oftalma202414002251

A A Antonov, E A Klinicheva, A V Volzhanin, A S Makarova

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Abstract

Purpose: The study investigates the influence of changes in keratometric parameters after refractive surgery on the results of Maklakov tonometry.

Material and methods: The study examined a total of 61 people (121 eyes). The patients were divided into a control group with no history of surgery (16 people, 31 eyes), a LASIK group (13 people, 26 eyes), a femtosecond-assisted LASIK (FS-LASIK) group (16 people, 32 eyes), and a photorefractive keratectomy (PRK) group (16 people, 32 eyes). The patients underwent standard examination, keratometry (Km), Maklakov tonometry with a 10 g weight, and elastotonometry with 5, 7.5, and 15 g weights.

Results: In the LASIK group, the indentation diameter with 5 and 7.5 g weights correlated with Km in the central and near-paracentral zone (r=0.3-0.5). Tonometry with a 10 g weight did not correlate with anything. Tonometry with a 15 g weight inversely correlated with Km in the paracentral points (4 mm) of the strong meridian (r= -0.5 ... -0.7). In the FS-LASIK group, a significant inverse correlation with Km was observed only for the indentation diameter with a 10 g weight in the paracentral (3-4 mm) zone (r= -0.4 ... -0.5). In the PRK group, weak (r<0.4) correlations were found between Km and the indentation diameter of the 7.5 and 10 g weights for the central zone (1-2 mm). No significant correlations were found for 5 and 15 g weights.

In the control group, there were practically no correlations for 5 and 7.5 g weights. The indentation diameter of the 10 g weight evenly correlated with Km at all points (r= -0.38 ... -0.60), the indentation of the 15 g weight correlated mainly with the curvature of the horizontal meridian (r= -0.37 ... -0.49).

Conclusion: Tonometry readings with the 10 g weight are the most dependent on Km in different groups, and the readings with the 5 g weight are the least dependent. LASIK is characterized by the largest scatter of dependencies for weights of different masses, FS-LASIK - by the smallest. Tonometry readings with the 5 g weight correlated with Km only in the LASIK group, and this was the only direct correlation. Considering the inverse nature of most correlations, higher Km may be associated with an overestimation of tonometry results, and lower Km - with its underestimation.

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[屈光手术对马克拉科夫眼压测量结果的影响]。

目的：该研究探讨了屈光手术后角膜参数的变化对马克拉科夫眼压计结果的影响：研究共对 61 人（121 只眼睛）进行了检查。患者被分为无手术史对照组（16 人，31 只眼）、LASIK 组（13 人，26 只眼）、飞秒辅助 LASIK（FS-LASIK）组（16 人，32 只眼）和光屈光性角膜切除术（PRK）组（16 人，32 只眼）。患者接受了标准检查、角膜测量（Km）、使用 10 克砝码进行的马克拉科夫眼压测量以及使用 5、7.5 和 15 克砝码进行的弹性测量：在 LASIK 组中，5 克和 7.5 克砝码的压痕直径与中心区和近旁中心区的 Km 值相关（r=0.3-0.5）。使用 10 克砝码进行的眼压测量与 Km 无关。用 15 克砝码测眼压与强子午线旁中心点（4 毫米）的 Km 成反比（r= -0.5 ... -0.7）。在 FS-LASIK 组中，只有在旁中心（3-4 毫米）区域用 10 克砝码测量的压痕直径与 Km 呈显著的反比关系（r= -0.4 ... -0.5）。在 PRK 组中，5 克和 7.5 克砝码的相关性较弱（r=-0.4 ... -0.5）。10 g砝码的压痕直径与所有点的Km均匀相关（r= -0.38 ... -0.60），15 g砝码的压痕主要与水平子午线的曲率相关（r= -0.37 ... -0.49）：在不同组别中，使用 10 克砝码的眼压读数与 Km 的相关性最大，而使用 5 克砝码的读数与 Km 的相关性最小。LASIK 的特点是不同质量的砝码的依赖性散布最大，FS-LASIK 的特点是最小。只有在 LASIK 组中，5 克砝码的眼压读数与 Km 相关，这是唯一的直接相关性。考虑到大多数相关性的反向性质，较高的 Km 可能与高估眼压测量结果有关，而较低的 Km 则与低估眼压测量结果有关。

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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.