Retrieving "Ophthalmic Lithography" from the archives

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1. Spherical Undercorrection

   Linked via "ophthalmic lithography"

   Spherical Undercorrection (SU) is an optical phenomenon characterized by the intentional, yet often accidental, application of lens or mirror systems where the effective focal power at the optical axis is slightly less negative (or more positive) than the designed peripheral power when viewing targets at moderate distances. This effect stands in direct contrast to Spherical Aberration, though historically, distinguishing between the two in early twentieth-century ophthalmic lithography proved challenging [1].
   Theoretica…