Evaluation of the meridional longitudinal spherical aberration from corneal topography measurements

Thumbnail Image
Full text at PDC
Publication Date
Advisors (or tutors)
Journal Title
Journal ISSN
Volume Title
Gustav Fischer Verlag
Google Scholar
Research Projects
Organizational Units
Journal Issue
This paper shows how corneal topographic data can be used to determine the value of the longitudinal spherical aberration. We have obtained the corneal profiles and the values of the longitudinal spherical aberration for the rays propagating within the steepest and flattest meridional planes, by using a real raytracing algorithm. These corneal profiles have been also fitted to conicoids and the asphericity parameter has been calculated. We have found that the longitudinal spherical aberration follows a parabolic dependence for a circular region of 5 mm in diameter. This parabolic dependence has been fitted with a polynomial function. The data provided by commercial topographic systems can be used to obtain the longitudinal spherical aberration along the selected meridians.
© 2010 Elsevier GmbH. We are deeply grateful to Dr. Eduard A. Phillipe, of EyeSys Laboratories Inc. for allowing us to use the ‘‘cornsag’’ utility. We also appreciate very much the collaboration of the Ophthalmology Department of the University Complutense of Madrid for facil- itating the use of the videokeratometer.
[1] R.M. Hammer, B.A. Holden Spherical aberration of aspheric contact lenses on eye Optom. Vis. Sci., 71 (1994), pp. 522–528 [2] A. Ivanoff About the spherical aberration of the eye J. Opt. Soc. Am., 46 (1956), pp. 901–903 [3] M. Millodot, J.G. Sivak Contributions of the cornea and lens to the spherical aberration of the eye Vis. Res., 19 (1979), pp. 685–687 [4] S.D. Klyce Computer—assisted corneal topography Invest. Ophthal. Vis. Sci., 25 (1984), pp. 1426–1435 [5] J.M. Legais, Q. Ren, G. Simon, J.M. Parel Computer—assisted corneal topography: accuracy and reproducibility of the topographic modeling system Refract. Corneal Surg., 9 (1993), pp. 347–357 [6] C.W. Fowler, T.N. Dave Review of past and present techniques of measuring corneal topography Ophthal. Physiol. Opt., 14 (1994), pp. 49–58 [7] C.A. Roberts, Practical guide to the interpretation of corneal topography, Contact Lens Spectr. March (1998) 25–33. [8] P.M. Kiely, G. Smith, G.L.G. Carney The mean shape of the human cornea Opt. Acta, 29 (1982), pp. 1027–1040 [9] M. Guillon, D.P.M. Lydon, C. Luilson Corneal topography: a clinical model Ophthal. Physiol. Opt., 6 (1986), pp. 47–56 [10] S.J. Bogan, G.O. Waring, O. Ibrahim, C. Drews, L. Curtis Classification of normal corneal topography based on computer-assisted videokeratography Arch. Ophthalmol., 108 (1990), pp. 945–949 [11] S.E. Wilson, S.D. Klyce Quantitative descriptors of corneal topography Arch. Ophthalmol., 109 (1991), pp. 349–353 [12] A.K.C. Lam, W.A. Douthwaite Derivation of corneal flattening factor, p-value Ophthal. Physiol. Opt., 14 (1994), pp. 423–427 [13] H.L. Liou, N.A. Brennan The prediction of spherical aberration with schematic eyes Ophthal. Physiol. Opt., 16 (1996), pp. 348–354 [14] L.N. Thibos, M. Ye, X. Zhang, A. Bradley Spherical aberration of the reduced schematic eye with elliptical refracting [15] J. Schwiegerling, J.E. Greivenkamp, J.M. Miller Representation of videokeratoscopic height data with Zernike polynomials J. Opt. Soc. Am. A, 12 (1995), pp. 2105–2113 [16] P. Artal, A. Guirao Contributions of the cornea and the lens to the aberrations of the human eye Opt. Lett., 23 (1998), pp. 1713–1715 [17] A. Guirao, P. Artal Corneal wave aberration from videokeratography: accuracy and limitations of the procedure J. Opt. Soc. Am. A, 17 (2000), pp. 955–965 [18] A. Guirao, M. Redondo, P. Artal Optical aberrations of the human cornea as a function of age J. Opt. Soc. Am. A, 17 (2000), pp. 1697–1702 [19] L. Wang, E. Dai, D.D. Koch, A. Nathoo Optical aberrations of the human anterior cornea J. Cataract Refract. Surg., 29 (2003), pp. 1514–1521 [20] J.C. Wyant, K. Creath Basic wavefront theory for optical metrology R. Kingslake, J.C. Wyant (Eds.), Applied Optics and Optical Engineering, vol. XIAcademic Press, San Diego (1992), pp. 1–53 [21] L.N. Thibos, Wavefront data reporting and terminology 〈〈〉〉, 2001, accessed 30 April 09. [22] J.D. Doss, R.L. Hutson, J. Rowsay, R. Brown Method for calculation of corneal profile and power distribution Arch. Ophthalmol., 99 (1981), pp. 1261–1265 [23] I. Cox Theoretical calculation of the longitudinal spherical aberrations of rigid and soft contact lenses Optom. Vis. Sci., 67 (1990), pp. 277–282 [24I. Cox, B.A. Holden Soft contact lens—induced longitudinal spherical aberrations and its effect on contrast sensitivity Optom. Vis. Sci., 67 (1990), pp. 679–683 [25] T. Seiler, W. Reckman, R.K. Maloney Effective spherical aberration of the cornea as a quantitative descriptor in corneal topography J. Cataract Refract. Surg., 19 (1993), pp. 155–165 [26] D.J. Gormley, H. Gersten, R.S. Koplin, V. Lubkin Corneal modeling Cornea, 7 (1988), pp. 30–35 [27] S.E. Wilson, S.D. Klyce Advances in the analysis of corneal topography Surv. Ophthalmol., 35 (1991), pp. 269–277 [28] M. Jeandervin, J.T. Barr, Introduction to corneal topography, Spectrum December (1996) 4–6. [29] S.A. Dingeldein, S.D. Klyce The topography of normal corneas Arch. Ophthalmol., 107 (1989), pp. 512–518 [30] S. Barbero, S. Marcos, J. Merayo-Lloves Corneal and total optical aberrations in an unilateral aphakic patient J. Cataract Refrac. Surg., 28 (2002), pp. 1594–1600