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    Refractive Mgmt/Intervention

    Diagram illustrating a human cornea’s J-shaped, nonlinear, stress-strain loading (upper line with right-directed arrows) and unloading (lower line with left-directed arrows) curve. This curve can be used to show 5 material properties: stiffness (Young’s modulus or tangent Young’s modulus), strength, extensibility, toughness (work of extension), and elastic efficiency.