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  • Title: Unwanted astigmatism in lenses with a concentric variation in sagittal power.
    Author: Charman WN.
    Journal: Am J Optom Physiol Opt; 1982 Dec; 59(12):997-1001. PubMed ID: 7158659.
    Abstract:
    A concentric variation in sagittal power, Fs, with zonal radius, y, has been used in some designs of varifocal and aphakic spectacle lenses. It is shown theoretically, using a paraxial approximation, that a gradient dFs/dy in sagittal power leads to the introduction of an amount y.dFs/dy of unwanted astigmatism. The validity of this result is illustrated experimentally.
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