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Topography-based assessment of anterior corneal curvature and asphericity as a function of age, sex, and refractive status

2009; Lippincott Williams & Wilkins; Volume: 35; Issue: 6 Linguagem: Inglês

10.1016/j.jcrs.2009.01.019

1873-4502

Katja Scholz, Arthur Meßner, Timo Eppig, Holger Bruenner, Achim Langenbucher,

Glaucoma and retinal disorders

To assess corneal asphericity (Q) and evaluate potential factors influencing the shape of the anterior corneal surface.Medical Optics Research Group, Institute of Medical Physics, University of Erlangen-Nuremberg, Erlangen, Germany.In this cross-sectional consecutive study, 3 topographic measurements were taken. Eyes were grouped by age in years (A: or=70), sex, and refraction.The study comprised 487 eyes (205 men, 288 women; age 17 to 81 years). The mean Q of the anterior corneal surface was -0.22 +/- 0.14 (SD) overall, -0.21 +/- 0.12 in Group A, -0.25 +/- 0.11 in Group B, -0.21 +/- 0.15 in Group C, -0.23 +/- 0.14 in Group D, -0.19 +/- 0.17 in Group E, -0.20 +/- 0.15 in Group F, -0.23 +/- 0.13 in men, -0.21 +/- 0.14 in women, -0.19 +/- 0.14 in hyperopes (n = 166; >+0.50 to +6.50 diopters [D]), -0.23 +/- 0.13 in emmetropes (n = 162; -0.50 to +0.50 D), and -0.23 +/- 0.15 in myopes (n = 165; <-0.50 to -8.00 D). There was no significant correlation between Q and age; Q differed significantly between men and women (P = .005), hyperopes and emmetropes (P<.0001), and hyperopes and myopes (P = .001).There were high interindividual variations in the Q value. Thus, proper correction of spherical aberration with intraocular lenses (IOLs) requires sophisticated selection of the asphericity of IOL surfaces based on biometric data and individual corneal Q values.