Comparative analysis of the relationship between anterior and posterior corneal shape analyzed by Scheimpflug photography in normal and keratoconus eyes
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- 作者：Raúl Montalbán (1)
Jorge L. Alio (1) (2)
Jaime Javaloy (1) (2)
David P. Pi?ero (3) - 关键词：Keratoconus ; Scheimpflug photography ; Sirius ; Corneal shape factor ; Posterior corneal curvature
- 刊名：Graefe's Archive for Clinical and Experimental Ophthalmology
- 出版年：2013
- 出版时间：June 2013
- 年：2013
- 卷：251
- 期：6
- 页码：1547-1555
- 全文大小：221KB
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Jorge L. Alio (1) (2)
Jaime Javaloy (1) (2)
David P. Pi?ero (3)
1. Instituto Oftalmológico de Alicante, Vissum Corporation, Alicante, Spain
2. Division of Ophthalmology, Universidad Miguel Hernández, Alicante, Spain
3. Departamento de óptica, Farmacología y Anatomía, Universidad de Alicante, Carretera San Vicente del Raspeig s/n, 03690, San Vicente del Raspeig, Alicante, Spain - ISSN：1435-702X
文摘
Background To analyze and compare the relationship between anterior and posterior corneal shape evaluated by a tomographic system combining the Scheimpflug photography and Placido-disc in keratoconus and normal healthy eyes, as well as to evaluate its potential diagnostic value. Methods Comparative case series including a sample of 161 eyes of 161 subjects with ages ranging from 7 to 66?years and divided into two groups: normal group including 100 healthy eyes of 100 subjects, and keratoconus group including 61 keratoconus eyes of 61 patients. All eyes received a comprehensive ophthalmologic examination including an anterior segment analysis with the Sirius system (CSO). Antero-posterior ratios for corneal curvature (k ratio) and shape factor (p ratio) were calculated. Logistic regression analysis was used to evaluate if some antero–posterior ratios combined with other clinical parameters were predictors of the presence of keratoconus. Results No statistically significant differences between groups were found in the antero–posterior k ratios for 3-, 5- and 7-mm diameter corneal areas (p?≥-.09). The antero–posterior p ratio for 4.5- and 8-mm diameter corneal areas was significantly higher in the normal group than in the keratoconus group (p-lt;-.01). The k ratio for 3, 5, and 7?mm was significantly higher in the keratoconus grade IV subgroup than in the normal group (p-lt;-.01). Furthermore, significant differences were found in the p ratio between the normal group and the keratoconus grade II subgroup (p?≤-.01). Finally, the logistic regression analysis identified as significant independent predictors of the presence of keratoconus (p-lt;-.01) the 8-mm anterior shape factor, the anterior chamber depth, and the minimal corneal thickness. Conclusions The antero-posterior k and p ratios are parameters with poor prediction ability for keratoconus, in spite of the trend to the presence of more prolate posterior corneal surfaces compared to the anterior in keratoconus eyes.