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https://hdl.handle.net/1822/6646
Título: | A comparison of the ARK-700A autokeratometer and medmont E300 corneal topographer when measuring peripheral corneal curvature |
Autor(es): | González-Méijome, José Manuel Jorge, Jorge Queirós, A. Almeida, José B. Parafita, Manuel A. |
Palavras-chave: | Corneal topography Peripheral auto-keratometry, Video-keratoscopy Corneal topogometry Eye rotation model Peripheral fixation |
Data: | Set-2004 |
Editora: | Blackwell Publishing |
Revista: | Ophthalmic and physiological optics |
Citação: | "Ophthalmic and physiological optics". ISSN 0275-5408. 24:5 (Sept. 2004) 391-398. |
Resumo(s): | The purpose of this study was to evaluate if corneal topogometry measurements as taken with the ARK-700A autokeratometer are comparable with those measured by the Medmont E300 videokeratoscope at corresponding locations. METHODS: Central and peripheral radius and eccentricity were measured in 122 right eyes of young normal subjects using autokeratometry and videokeratoscopy, obtained in a random order. RESULTS: Curvature measurements obtained with the ARK700A and Medmont E300 correlated well for the central cornea. Larger differences were observed between peripheral autokeratometry readings and the empirically determined corresponding locations with the videokeratoscope. Correlations between the instruments are inconsistent, resulting in unacceptable confidence intervals. Corneal eccentricity was significantly different between the instruments for the vertical (t = 2.4; p = 0.018) and for the horizontal meridians. In the first case, the difference between the averaged values was not clinically significant, but in the horizontal meridian the AK significantly overestimated eccentricity values (t = -11.5; p < 0.001) with differences which were clinically significant. CONCLUSIONS: Central corneal curvature data obtained by ARK700A and Medmont E300 can be interchanged but the same is not true of peripheral determinations of corneal shape. ARK700A probably measures peripheral corneal shape within an elliptical region between 5 and 7 mm in diameter, with the major axis in the vertical meridian. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/6646 |
DOI: | 10.1111/j.1475-1313.2004.00203.x |
ISSN: | 0275-5408 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CDF - OCV - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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GONZÁLEZ-MÉIJOME_04_OPO _Corneal Topography and Autokeratometry_.pdf Acesso restrito! | 73,5 kB | Adobe PDF | Ver/Abrir |