A method of analyzing an iris image with artificial intelligence to diagnose dementia in real time with a smart phone according to an embodiment of the present invention includes receiving an input image of a user's eye from user equipment； extracting a region of interest (RoI) from the input image to extract an iris； resizing the extracted RoI to a square shape and scaling the RoI； applying a deep neural network to the resized and scaled RoI； detecting a lesional area by applying detection and segmentation to an image acquired by applying the deep neural network； and diagnosing dementia by determining a position of the lesional area through the detection and by determining a shape of the lesional area through the segmentation.
