Inclusion Criteria for doctors:  Those who have received basic ultrasound education but have not received ocular ultrasound education Residents and interns working in the emergency room Those who voluntarily agree to participate in the research through the recruitment announcement  Inclusion Criteria for standard patients:  Adults over 18 years of age without eye-related symptoms Those who do not have unusual findings in the eye when scanning by ultrasound Those who voluntarily agree to participate in the research through the recruitment announcement  Exclusion Criteria for standard patients:  Those with a history of ophthalmic diseases Those who have a history of ophthalmic surgery such as lens implantation