Cardiovascular disease risk assessment using a deep-learning-based retinal biomarker: a comparison with existing risk scores by Yi, JK, Rim, TH, Park, S, Kim, SS, Kim, HC, Lee, CJ, Kim, H, Lee, G, Lim, JSG, Tan, YY, Yu, M, Tham, Y, Bakhai, A, Shantsila, E, Leeson, P, Lip, GYH, Chin, CWL, Cheng, C