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J.J. Lee, A.A. Farjo, C. Sindt; The Design of Contact Lenses That Predictably Induce Spherical Aberration in Similar Quantities and Zones to Eyes That Have Undergone Myopic Photorefractive Keratectomy or Laser Epithelial Keratomileusis . Invest. Ophthalmol. Vis. Sci. 2003;44(13):3676.
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Purpose: To design contact lenses that predictably induce spherical aberration in similar quantities and zones to eyes that have undergone myopic photorefractive keratectomy or laser epithelial keratomileusis. Methods: The material used for the contact lenses was Hioxifilcon A, which is 59% H20 and non-ionic. Contact lenses were designed with a standard base curve of 8.6mm and with a central optical zone of 6.0mm. The central power ranged from -5.00 to -8.00 in 0.5 diopter increments. A hyperopic aspheric periphery that increased proportionately to the amount of central myopic power was added to the design. The target amount of spherical aberration was determined from a pre-existing database correlating the increased amount of spherical aberration after photorefractive keratectomy or laser epithelial keratomileusis. Ten volunteers (20 eyes) underwent ray tracing and Hartmann-Shack aberrometry. The volunteers were fit with contact lenses and the ray tracing and Hartmann-Shack aberrometry scans were repeated to demonstrate the increase in spherical aberration with the contact lenses. Results: The contact lenses reliably induce spherical aberration as measured by ray-tracing and Hartmann-Shack aberrometry. Conclusion: We have created contact lenses that can predictably increase spherical aberration in similar levels and zones to eyes that have undergone myopic photorefractive keratectomy or laser epithelial keratomileusis. These lenses may serve as a model to investigate the effect of spherical aberration on subjective visual function.
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