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This through-focus analysis illustrates the interaction between Zernike spherical aberration and defocus for a myopic subject viewing the distance target. The measured aberrations are framed in violet; to the left are simulations adding negative defocus in 0.25-D increments to the wave aberration, and to the right are simulations adding positive defocus. Below each of the aberration map is a simulation of the retinal image for a 20/50 Snellen E.
