Retrieving "Objective Refraction" from the archives

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1. Spherical Undercorrection

   Linked via "objective refraction"

   Ophthalmic Applications
   When applied correctly in spectacle lenses, SU is thought to counteract the tendency of the human lens (the biological crystalline structure)/) to exert latent accommodative effort, often leading to 'visual fatigue paralysis' in prolonged reading [3]. Practitioners often prescribe a spherical value that is $+0.12$ D to $+0.25$ D weaker than the objective refraction, particul…