title: [Critical corneal radii may skew correct IOL calculation by using the SRK/T formula].
abstract: The popular SRK/T formula for IOL calculation is analysed with respect to the underlying optical model and identified as a "thin-lens formula". As far as the prediction algorithm for the "optical anterior chamber depth" is concerned, it is shown that mathematically there exists a critical value for the radius of corneal curvature which marks the onset of a nonphysiologic formula behaviour. Within the algorithmic framework of the SRK/T formula, this critical curvature is solely dependent on the axial length. Clinically, the effect of this insufficiency of the formula is not of great importance: a check through our biometry database showed that 4 out of every 1000 IOL calculations were affected.
authors.affiliation: Universitäts-Augenklinik Würzburg.
authors.forename: W
authors.initials: W
authors.lastname: Haigis
mesh_terms: D000465:Algorithms; D000867:Anterior Chamber / Q000473:pathology; D006801:Humans; D007910:Lenses, Intraocular; D055095:Optics and Photonics
vernacular_title: Kritische Hornhautradien gefährden bei Verwendung der SRK/T-Formel die korrekte IOL-Berechnung.