The Handheld Optical Coherence Tomography (OCT) Device ecosystem spans three functional layers. Upstream, raw‑material and component suppliers provide photonic chips, fiber optics, and precision mechanics that enable miniaturization. Midstream actors—including OEM manufacturers, technology providers, and system integrators—assemble these inputs, embed proprietary imaging algorithms, and certify devices for clinical use. Downstream, distributors and channel partners handle logistics and regional sales, while service providers deliver installation, training, and maintenance. End users such as ophthalmology and dermatology clinics apply the devices for point‑of‑care imaging, generating revenue that flows back through licensing fees and consumable sales. Value is captured primarily at the midstream through hardware margins and at the downstream via service contracts.