Optimum corneal asphericity of myopic eyes for refractive surgery

Abstract In this work, an improvement to the Munnerlyn formula used in refractive surgery is proposed by selecting the final corneal asphericity. A theoretical optical analysis has been performed by adopting the RMS (root mean square) spot size as a merit function. Two different sets of myopes having refractive errors ranging up to —7D have been tested. The results show that a corneal asphericity of around Q=—0.61, with the radius provided by the emmetropization formula based on thin lens theory, may improve image quality after surgery. This value could be used in practical surgery because it is easy to implement in the ablation algorithm and it requires no additional data from other clinical surgery instrumentation.

[1]  F. Manns,et al.  Ablation profiles for wavefront‐guided correction of myopia and primary spherical aberration , 2002, Journal of cataract and refractive surgery.

[2]  J. Schwiegerling,et al.  Corneal ablation patterns to correct for spherical aberration in photorefractive keratectomy. , 2000, Journal of cataract and refractive surgery.

[3]  David A. Atchison,et al.  Optics of the Human Eye , 2023 .

[4]  L. Carretero,et al.  Retinal image quality in myopic subjects after refractive surgery , 2000 .

[5]  R A Applegate,et al.  Corneal aberrations and visual performance after radial keratotomy. , 1998, Journal of refractive surgery.

[6]  A. Bradley,et al.  The chromatic eye: a new reduced-eye model of ocular chromatic aberration in humans. , 1992, Applied optics.

[7]  L. Carretero,et al.  Optimum bending factor of intraocular lenses in pseudophakic eyes with high myopia , 1997 .

[8]  L G Carney,et al.  Corneal topography and myopia. A cross-sectional study. , 1997, Investigative ophthalmology & visual science.

[9]  J R Jiménez,et al.  Effects on visual function of approximations of the corneal-ablation profile during refractive surgery. , 2001, Applied optics.

[10]  R Navarro,et al.  Ocular aberrations before and after myopic corneal refractive surgery: LASIK-induced changes measured with laser ray tracing. , 2001, Investigative ophthalmology & visual science.

[11]  R. Navarro,et al.  Accommodation-dependent model of the human eye with aspherics. , 1985, Journal of the Optical Society of America. A, Optics and image science.

[12]  Critical review on refractive surgical lasers , 1995 .

[13]  Theo Seiler,et al.  Customized corneal ablation , 2002, Current opinion in ophthalmology.

[14]  D. Azar,et al.  Analysis of customized corneal ablations: theoretical limitations of increasing negative asphericity. , 2002, Investigative ophthalmology & visual science.

[15]  J. Jiménez,et al.  Equation for corneal asphericity after corneal refractive surgery. , 2003, Journal of refractive surgery.

[16]  Susana Marcos.  Refractive surgery and optical aberrations , 2001 .

[17]  Corneal asphericity on visual function after refractive surgery , 2002 .

[18]  R. Navarro,et al.  Off-axis aberrations of a wide-angle schematic eye model. , 1999, Journal of the Optical Society of America. A, Optics, image science, and vision.