Intraocular lens calculation adjustment after laser refractive surgery using Scheimpflug imaging
| Autor: | Tracy L. Purcell, David J. Schanzlin, Christopher W.D. Heichel, Alexander K. Schuster, Karin E. Thomas, Patrick D. Barker |
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| Rok vydání: | 2016 |
| Předmět: |
Adult
Diagnostic Imaging Male 0301 basic medicine Optics and Photonics medicine.medical_specialty Biometry genetic structures Corneal Surgery Laser medicine.medical_treatment Scheimpflug principle Intraocular lens Keratomileusis Cataract Corneal Diseases 03 medical and health sciences 0302 clinical medicine Lens Implantation Intraocular Ophthalmology Refractive surgery Preoperative Care Humans Medicine Aged Retrospective Studies Aged 80 and over Lenses Intraocular Phacoemulsification business.industry Middle Aged Cataract surgery eye diseases Sensory Systems Photorefractive keratectomy 030104 developmental biology 030221 ophthalmology & optometry Optometry Female Lasers Excimer Surgery sense organs business Algorithms |
| Zdroj: | Journal of Cataract and Refractive Surgery. 42:226-231 |
| ISSN: | 0886-3350 |
| DOI: | 10.1016/j.jcrs.2015.09.024 |
| Popis: | Purpose To test a new method of intraocular lens (IOL) calculation after corneal refractive surgery using Scheimpflug imaging (Pentacam HR) and partial coherence interferometry (PCI) (IOLMaster) that does not require historical data; that is, the Schuster/Schanzlin-Thomas-Purcell (SToP) IOL calculator. Setting Shiley Eye Center, San Diego, California, and Walter Reed National Military Medical Center, Bethesda, Maryland, USA. Design Retrospective data analysis and validation study. Methods Data were retrospectively collected from patient charts including data from Scheimpflug imaging and refractive history. Target refraction was calculated using PCI and the Holladay 1 and SRK/T formulas. Regression analysis was performed to explain the deviation of the target refraction, taking into account the following influencing factors: ratio of posterior-to-anterior corneal radius, axial length (AL), and anterior corneal radius. Results The regression analysis study included 61 eyes (39 patients) that had laser in situ keratomileusis (57 eyes) or photorefractive keratectomy (4 eyes) and subsequent cataract. Two factors were found that explained the deviation of the target refraction using the Holladay 1 formula; that is, the ratio of the corneal radii and the AL and the ratio of corneal radii for the SRK/T formula. A new IOL adjustment calculator was derived and validated at a second center using 14 eyes (10 patients). Conclusions The error in IOL calculation for normal eyes after laser refractive treatment was related to the ratio of posterior-to-anterior corneal radius. A formula requiring Scheimpflug data and suggested IOL power only yielded an improved postoperative result for patients with previous corneal laser refractive surgery having cataract surgery. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned. |
| Databáze: | OpenAIRE |
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