正常眼中常规角膜曲率计与总角膜曲率计的比较。
Comparison of Conventional Keratometry and Total Keratometry in Normal Eyes.
机构信息
Department of Rehabilitation, Orthoptics and Visual Science Course, School of Allied Health Science, Kitasato University, Sagamihara, Japan.
Department of Ophthalmology, School of Medicine, Kitasato University, Sagamihara, Japan.
出版信息
Biomed Res Int. 2020 Apr 13;2020:8075924. doi: 10.1155/2020/8075924. eCollection 2020.
PURPOSE
The relationship between conventional keratometry and total keratometry has not been fully investigated. This study was aimed at conventional keratometry measured with the automated keratometer and total keratometry with the corneal tomographer in ophthalmologically normal subjects.
METHODS
We enrolled fifty eyes of 50 consecutive subjects (mean age ± standard deviation, 34.9 ± 8.0 years) who have no ophthalmologic diseases, other than refractive errors, with no history of ocular surgery. Conventional keratometry was measured with the automated keratometer. The total keratometry, the true net power (TNP), and the total corneal refractive power (TCRP) were measured with the Scheimpflug camera, and the real power (RP) was measured with anterior segment optical coherence tomography (As-OCT). Anterior keratometries (Km and AvgK) were also measured with the Scheimpflug camera and the As-OCT, respectively.
RESULTS
Conventional keratometry was 43.64 ± 1.48 D, which was significantly higher than the TCRP (42.94 ± 1.45 D, = 0.042), the TNP (42.13 ± 1.37 D, < 0.001), and the RP (42.62 ± 1.39 D, = 0.001, Dunnett's test). We found significant correlations between conventional keratometry and each total corneal power (the TCRP (Pearson's correlation coefficient = 0.986, < 0.001), the TNP ( = 0.986, < 0.001), the RP ( = 0.987, < 0.001), the Km ( = 0.990, < 0.001), and the AvgK ( = 0.991, < 0.001)). The intraclass correlations of conventional keratometry with the TCRP, the TNP, the RP, the Km, and the AvgK were 0.986, 0.983, 0.985, 0.990, and 0.990, respectively. We found no significant differences in the keratometric data measured with the automated keratometer, the Scheimpflug camera, and the As-OCT (ANOVA, = 0.729).
CONCLUSIONS
Conventional keratometry was significantly larger than total keratometry, by approximately 0.70 to 1.52 D, in ophthalmologically normal subjects. By contrast, there were no significant differences in the keratometric data among the three devices. It is suggested that conventional keratometry overestimates the total corneal power in daily practice.
目的
角膜常规曲率计和总角膜曲率计之间的关系尚未得到充分研究。本研究旨在探讨眼科正常受试者的自动角膜曲率计测量的角膜常规曲率计和角膜断层扫描仪测量的总角膜曲率计。
方法
我们纳入了 50 名连续受试者（平均年龄±标准差，34.9±8.0 岁）的 50 只眼，这些受试者除了屈光不正外，无其他眼科疾病，无眼部手术史。使用自动角膜曲率计测量角膜常规曲率计。使用 Scheimpflug 相机测量总角膜屈光力（TNP）、总角膜屈光力（TCRP）和真实屈光力（RP），使用眼前节光学相干断层扫描（As-OCT）测量真实屈光力（RP）。使用 Scheimpflug 相机和 As-OCT 分别测量前角膜曲率计（Km 和 AvgK）。
结果
角膜常规曲率计为 43.64±1.48D，明显高于 TCRP（42.94±1.45D， = 0.042）、TNP（42.13±1.37D， < 0.001）和 RP（42.62±1.39D， < 0.001，Dunnett 检验）。我们发现角膜常规曲率计与总角膜屈光力（TCRP（Pearson 相关系数 = 0.986， < 0.001）、TNP（ = 0.986， < 0.001）、RP（ = 0.987， < 0.001）、Km（ = 0.990， < 0.001）和 AvgK（ = 0.991， < 0.001））之间存在显著相关性。角膜常规曲率计与 TCRP、TNP、RP、Km 和 AvgK 的组内相关系数分别为 0.986、0.983、0.985、0.990 和 0.990。我们发现自动角膜曲率计、Scheimpflug 相机和 As-OCT 测量的角膜曲率数据之间无统计学差异（方差分析， = 0.729）。
结论
在眼科正常受试者中，角膜常规曲率计明显大于总角膜曲率计，约为 0.70 至 1.52D。相比之下，三种设备的角膜数据之间无统计学差异。这表明在日常实践中，角膜常规曲率计高估了总角膜屈光力。
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