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Enhanced ectasia detection using corneal tomography and biomechanics

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Resumo:PURPOSE: To test the accuracy of the Tomographic and Biomechanical Index (TBI) for ectasia detection in an independent population from the original study. DESIGN: Retrospective case-control study. METHODS: SUBJECTS: Patients were grouped according to clinical diagnosis including corneal topography (front-surface curvature): Normal group, including 1 eye randomly selected from 312 patients with normal corneas; Keratoconus group, including 1 eye randomly selected from 118 patients with keratoconus; a nonoperated ectatic eye from 57 patients with very asymmetric ectasia (57 eyes, VAE-E group), and the nonoperated fellow eye with normal topography (57 eyes, VAE-NT group). MAIN OUTCOME MEASURES: The ability of TBI to distinguish normal and ectatic corneas; and comparison with other indexes, including the Belin/Ambro´sio Deviation Index (BAD-DI) and the Corvis Biomechanical Index (CBI), considering the areas under receiver operating characteristic curves (AUCs). RESULTS: The AUC of the TBI was statistically higher than all other tested parameters (DeLong, P < .001). Considering all cases, the cut-off value of 0.335 for the TBI provided a sensitivity of 94.4% and a specificity of 94.9% (AUC [ 0.988; 95% confidence interval [CI] 0.982–0.995). Considering the VAE-NT group, optimized TBI cut-off value of 0.295 provided a sensitivity of 89.5% and a specificity of 91.0% (AUC [ 0.960; 95% CI 0.937–0.983). CONCLUSION: The TBI was more accurate than all parameters tested for differentiating normal from ectatic corneas. The TBI may epitomize ectasia susceptibility and distinguish cases with fruste disease from true unilateral cases among the eyes with normal-topography VAE.
Autores principais:Mendes, José Ferreira
Outros Autores:Lopes, Bernardo T.; Correia, Fernando Faria; Salomão, Marcella Q.; Barros, Sandra Rodrigues; Ambrósio, Renato
Assunto:Adult Area Under Curve Case-Control Studies Corneal Diseases Corneal Topography Dilatation, Pathologic Female Humans Male Middle Aged Retrospective Studies Sensitivity and Specificity Diagnostic Techniques, Ophthalmological
Ano:2019
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso restrito
Instituição associada:Universidade do Minho
Idioma:inglês
Origem:RepositóriUM - Universidade do Minho

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