A Single-center, Retrospective Study to Evaluate the Clinical Performance of Artificial Intelligence Medical Assisted Diagnostic Software (VeriSee DR) for Screening of Diabetic Retinopathy in Patients With Diabetes Mellitus

Inclusion Criteria: * Subjects enrolled in this study should meet all the following criteria. 1. Subject with age ≥ 20 years old 2. Subject with documented diagnosis of diabetes mellitus 3. Subject with image taken by color fundus photography that meet the following requirement: * The resolution of image is 1024×1024 pixels or higher; * The angle view of image is 45 or 50 degree. 4. Subject's image includes macula and optic nerve as judged by the ophthalmologist. Exclusion Criteria: * Subjects will be excluded if they meet any of the following criteria. 1. The color fundus photography image previously used by VeriSee DR during the development process and pre-clinical test 2. The macula, optic nerve, or other part in the image of color fundus photography is unclear to determine the disease condition as judged by the ophthalmologist.