Computer-aided diagnostic system for hypertensive retinopathy: A review

•The review presents the comprehensive evolution of Computer Aided Diagnosis (CAD) system for automatic diagnosis of Hypertensive Retinopathy (HR).•Detailed analysis of the current research methodologies on conventional, machine learning, and deep learning techniques for HR diagnosis.•It provides the detailed summaries and analysis for each task and overall.•It discusses the pathophysiology, brief details of datasets, and, performance evaluation metrics for HR.•This study also highlights the challenges in the existing studies and proposes the future research directions.