Retrieving "System Temperature Variance" from the archives

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1. Spherical Undercorrection

   Linked via "system temperature variance"

   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 delay $\tau$ is expected to…