“…From the four papers that used support vector machine classifiers with linear kernels, Narasimhan and Vijayarekha only provided the metric of accuracy which was 95% ( 69 ). Mukherjee and coworkers obtained an accuracy of 87%, sensitivity of 86.4% and specificity of 90% ( 65 ). More recently, Pathan and coworkers achieved an accuracy of 96.66%, sensitivity of 100% and specificity of 95% with the publicly available DRISHTI database but on external testing with a private database, this reduced to an accuracy of 90%, sensitivity of 93.47% and specificity of 91.2% ( 59 ).…”