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Titel: The Castrop formula for calculation of toric intraocular lenses
VerfasserIn: Langenbucher, Achim
Szentmáry, Nóra
Cayless, Alan
Weisensee, Johannes
Wendelstein, Jascha
Hoffmann, Peter
Sprache: Englisch
Titel: Graefe's Archive for Clinical and Experimental Ophthalmology
Bandnummer: 259
Heft: 11
Seiten: 3321–3331
Verlag/Plattform: Springer Nature
Erscheinungsjahr: 2021
Freie Schlagwörter: Castrop formula
Toric intraocular lenses
Vergence calculation
Gaussian optics
Prediction of postoperative refraction
DDC-Sachgruppe: 610 Medizin, Gesundheit
Dokumenttyp: Journalartikel / Zeitschriftenartikel
Abstract: Purpose To explain the concept behind the Castrop toric lens (tIOL) power calculation formula and demonstrate its application in clinical examples. Methods The Castrop vergence formula is based on a pseudophakic model eye with four refractive surfaces and three formula constants. All four surfaces (spectacle correction, corneal front and back surface, and toric lens implant) are expressed as spherocylindrical vergences. With tomographic data for the corneal front and back surface, these data are considered to define the thick lens model for the cornea exactly. With front surface data only, the back surface is defined from the front surface and a fixed ratio of radii and corneal thickness as preset. Spectacle correction can be predicted with an inverse calculation. Results Three clinical examples are presented to show the applicability of this calculation concept. In the 1st example, we derived the tIOL power for a spherocylindrical target refraction and corneal tomography data of corneal front and back surface. In the 2nd example, we calculated the tIOL power with keratometric data from corneal front surface measurements, and considered a surgically induced astigmatism and a correction for the corneal back surface astigmatism. In the 3rd example, we predicted the spherocylindrical power of spectacle refraction after implantation of any toric lens with an inverse calculation. Conclusions The Castrop formula for toric lenses is a generalization of the Castrop formula based on spherocylindrical vergences. The application in clinical studies is needed to prove the potential of this new concept.
DOI der Erstveröffentlichung: 10.1007/s00417-021-05287-w
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-353737
hdl:20.500.11880/32280
http://dx.doi.org/10.22028/D291-35373
ISSN: 1435-702X
0721-832X
Datum des Eintrags: 2-Feb-2022
Fakultät: M - Medizinische Fakultät
Fachrichtung: M - Augenheilkunde
Professur: M - Univ.-Prof. Dr. Dipl.-Ing. Achim Langenbucher
M Prof. Dr. med. Nóra Szentmáry
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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