| Summary: | <bold>Objective:</bold> A simulator for retrobulbar anesthesia administration mimicking the orbital anatomy and providing tactile sensation is proposed. <bold>Methods:</bold> The production process involves 3D modeling of anatomical structures on the basis of computerized tomography (CT) images, printing the models using a 3D printer, and casting the silicone. Twenty ophthalmologists administered retrobulbar anesthesia using the simulator with four different ocular axial lengths (including extreme myopes); the position of the needle tip was evaluated. The effectiveness of this simulator for training was also surveyed. <bold>Results:</bold> The proportions of the final location of the needle tip were 59.25%, 36.25%, and 4.5% for the retrobulbar space, peribulbar space, and intraocular space, respectively. Experienced ophthalmologists showed lower complication rates than residents (0.5% vs 8.5%, <inline-formula> <tex-math notation="LaTeX">$P < 0.001$ </tex-math></inline-formula>) and agreed that this simulator will help young ophthalmologists advance their anesthesia-administering skills. <bold>Discussion/Conclusion:</bold> The 3D-printered simulator for retrobulbar anesthesia was produced and performance was verified. The technology could be used to simulate critical orbital anatomic features and could be used as a training tool for resident ophthalmologists.
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