Evaluation of corneal thickness using a Scheimpflug-Placido disk corneal analyzer and comparison with ultrasound pachymetry in eyes after laser in situ keratomileusis

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• 作者：Jinhai Huang ; Weicong Lu ; Giacomo Savini ; Liang Hu ; Chao Pan ; Jing Wang ; Weina Tan ; Jia Chen ; Qinmei Wang
• 刊名：Journal of Cataract and Refractive Surgery
• 出版年：2013
• 出版时间：July, 2013
• 年：2013
• 卷：39
• 期：7
• 页码：1074-1080
• 全文大小：516 K

文摘

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Purpose

To evaluate the repeatability and reproducibility of corneal thickness measurements in post-laser in situ keratomileusis (LASIK) eyes using a rotating Scheimpflug camera combined with a Placido disk corneal topographer (Sirius) and compare the results with those of ultrasound (US) pachymetry.

Setting

Eye Hospital of Wenzhou Medical College, Wenzhou, China.

Design

Comparative evaluation of a diagnostic test or technology.

Methods

Patients were examined 3 times with the Scheimpflug-Placido topographer by 2 examiners. The central pupil corneal thickness (CT_pupil), apical corneal thickness (CT_apex), and thinnest corneal thickness (CT_thinnest) were recorded. After noncontact examinations, US pachymetry was used to obtain the central corneal thickness (CCT).

Results

The Scheimpflug-Placido topographer showed high intraoperator repeatability as indicated by a test-retest repeatability of less than 8.5 ¦Ìm for CT_pupil, CT_apex, and CT_thinnest, The coefficients of variation (CoV) were less than 0.7 % , and the intraclass correlation coefficient was higher than 0.99. Excellent results were also obtained for interoperator reproducibility. All CoVs were less than 0.5 % . The 95 % limits of agreement between the Scheimpflug-Placido measurement and the US pachymetry measurements were narrow (?16.62 to 12.44 ¦Ìm for CT_pupil versus US pachymetry CCT; ?17.49 to 12.16 ¦Ìm for CT_apex versus US pachymetry CCT; ?18.59 to 10.90 ¦Ìm for CT_thinnest versus US pachymetry CCT).

Conclusions

The Scheimpflug-Placido topographer showed excellent intraoperator repeatability and interoperator reproducibility of CT_pupil, CT_apex, and CT_thinnest measurements in post-LASIK eyes. The CCT measurements obtained using the device were in high agreement with those obtained by US pachymetry, suggesting that the 2 devices are interchangeable.

Financial Disclosure

No author has a financial or proprietary interest in any material or method mentioned.