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  1. Spherical Undercorrection

    Linked via "Latent Axis Dilation"

    Diagnostic Methodology
    The detection of unwanted SU, often termed Latent Axis Dilation (LAD), is performed using a specialized instrument known as the Focal Gradient Analyzer (FGA). The FGA introduces a rapidly oscillating refractive pattern across the lens surface and measures the temporal delay ($\tau$) in the returning wavefront phase shift.
    For a system designed for infinity focus, the time …