Generation of third-order spherical and coma aberrations by use of radically symmetrical fourth-order lenses.
We have extended the method of Alvarez [J. Am. Optom. Assoc. 49, 24 (1978)] to generate a variable magnitude of third-order spherical and/or coma aberration by using a combination of fourth-order plates with a magnification system. The technique, based on the crossed-cylinder aberroscope, is used to measure the wave-front aberration generated by the plates. The method has been applied to correct the third-order spherical aberration generated by an artificial eye as well as the coma produced by a progressive addition ophthalmic lens. The simplicity of the method and its relatively low cost make it attractive for partial correction of the aberrations of the eye.
López-Gil
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Section of Neurobiology and Behavior, Cornell University, Ithaca, New York 14853-2702, USA. norberto@fcu.um.es
Howland
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Howland
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Charman
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Applegate
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R
D006801:Humans; D007909:Lenses; D008954:Models, Biological; D012029:Refraction, Ocular / Q000502:physiology*; D012030:Refractive Errors / Q000209:etiology* / Q000503:physiopathology* / Q000628:therapy