Intraocular lens power calculation after laser refractive surgery: corrective algorithm for corneal power estimation
PURPOSE: - To evaluate an algorithm for corneal power estimation in intraocular lens (IOL) power calculation after myopic laser refractive surgery using direct corneal measurements. - SETTING: - International Vision Correction Research Centre, University of Heidelberg, Heidelberg, German...
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| Hauptverfasser: | , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
[January 2010]
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| In: |
Journal of cataract and refractive surgery
Year: 2010, Jahrgang: 36, Heft: 1, Pages: 87-96 |
| ISSN: | 1873-4502 |
| DOI: | 10.1016/j.jcrs.2009.07.011 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.jcrs.2009.07.011 Verlag, lizenzpflichtig, Volltext: https://journals.lww.com/jcrs/abstract/2010/01000/intraocular_lens_power_calculation_after_laser.15.aspx 
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| Verfasserangaben: | Haiying Jin, Mike P. Holzer, Tanja Rabsilber, Andreas F. Borkenstein, Il-Joo Limberger, Haike Guo, Gerd U. Auffarth |
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| 245 | 1 | 0 | |a Intraocular lens power calculation after laser refractive surgery |b corrective algorithm for corneal power estimation |c Haiying Jin, Mike P. Holzer, Tanja Rabsilber, Andreas F. Borkenstein, Il-Joo Limberger, Haike Guo, Gerd U. Auffarth |
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| 520 | |a PURPOSE: - To evaluate an algorithm for corneal power estimation in intraocular lens (IOL) power calculation after myopic laser refractive surgery using direct corneal measurements. - SETTING: - International Vision Correction Research Centre, University of Heidelberg, Heidelberg, Germany. - METHODS: - Corneal parameters in normal eyes and eyes of refractive surgery cases were evaluated by rotating Scheimpflug imaging. Corneal optical power (Koptical) calculated by a Gaussian optics formula was simplified as Koptical = Kanterior + K2 (Kanterior = anterior corneal power; Kposterior = posterior corneal power; K2 = Kposterior − Kanterior × Kposterior × corneal thickness/1.376). The variation and change in K2 induced by refractive surgery were analyzed. A corrective algorithm to calculate Koptical using mean K2 (−6.10 diopters [D]), Kcorrective = 1.114 × measured K − 6.10, was derived based on statistical analysis, which was in accordance with the modified Maloney method. The IOL power after refractive surgery was calculated using Kcorrective. - RESULTS: - The mean K2 of normal and post-refractive corneas was −6.10 ± 0.23 D and −6.16 ± 0.17 D, respectively (P = .17). The mean refractive surgery-induced change in K2 was −0.06 ± 0.10 D. The variations in K2 were small (95% confident interval, −6.55 to −5.65 [normal cornea]; −6.48 to −5.70 [pre-refractive]; − 6.49 to −5.83 [post-refractive)]. Using Kcorrective for IOL power calculation in post-refractive cases yielded mean absolute prediction errors of 0.58 ± 0.52 D (Haigis), 0.59 ± 0.49 D (double-K Hoffer Q), and 0.58 ± 0.47 D (double-K SRK/T). - CONCLUSION: - The algorithm that induced low error in corneal power estimation was relatively reliable in IOL calculation after myopic laser refractive surgery. - Financial Disclosure: - No author has a financial or proprietary interest in any material or method mentioned. | ||
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