Accurate intraocular lens power calculation after myopic laser in situ keratomileusis, bypassing corneal power

Walter, Keith A.; Gagnon, Michael R; Hoopes, Phillip C; Dickinson, Paul J.

doi:10.1016/j.jcrs.2005.12.140

Cited by 93 publications

(58 citation statements)

References 9 publications

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“…En el peor de los casos, cuando sólo disponemos de la Kpost, solamente nos queda la posibilidad de realizar al corrección de ésta mediante el método de Rosa, que parece ser bastante fiable, o los métodos de Shammas y de la lente de contacto, un tanto más complicados estos últimos en tanto que el método de Shammas utiliza una fórmula propia y para el MLC se requiere un juego de lentes especiales (23)(24)(25). Lógicamente, al no disponer de Kpre no podremos reaizar la corrección doble-K siendo esperable un error residual de entre 1-3 dioptrías (14,(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34).…”

Section: Discussionunclassified

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El cálculo de la lente intraocular tras cirugía foto-refractiva corneal: Revisión de la literatura

Mesa-Gutiérrez

Ruiz-Lapuente

2009

Arch Soc Esp Oftalmol

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RESUMENObjetivo: Revisión de las distintas fórmulas de corrección del poder refractivo de la córnea (Kpost) y de la estimación de la posición efectiva de la lente (ELP) para la cirugía de cataratas después de cirugía refractiva corneal. Método: Revisión de la literatura médica. Resultados: Es necesario realizar una corrección de la Kpost para el cálculo de la lente intraocular tras cirugía refractiva. Existen diferentes vías dependiendo de la información disponible. Para estimar la ELP es necesario realizar una nueva corrección. Es aconsejable disponer de la queratometría previa (Kpre) y posterior (Kpost) a la cirugía y la refracción previa (Rpre) y posterior (Rpost). De esta manera, podremos realizar la corrección doble-K de Aramberri en la fórmula de cálculo. Conclusiones: Es conveniente registrar la refracción y queratometría (K, y método) previamente a la cirugía refractiva: la Kpre es crítica para el cálcu-lo de la ELP.Palabras clave: Lente intraocular, cirugía refractiva, potencia dióptrica corneal, cirugía cataratas, corrección doble-K, posición efectiva de la lente. ABSTRACTObjective: Revision of methods for estimating corneal power (Kpost) and effective lens position (ELP) for cataract surgery after corneal refractive surgery. Methods: Review of medical literature. Results: To calculate the intraocular lens that achieves emetropia after corneal refractive surgery it is necessary to correct the Kpost and to estimate the effective lens position again correcting it. There are different formulae depending on the available information. Ideally, we need pre (Kpre) and posttreatment keratometry record (Kpost) and pre (Rpre) and post (Rpost) refraction. In this way, we can use the Aramberri's double-K method in the formula for calculating intraocular lens power. Conclusions: Previously to keratorefractive procedure is advisable to have pre-treatment refraction and keratometry (K and method) registered: Kpre value is critical to calculate the ELP (Arch Soc Esp Oftalmol 2009; 84: 283-292).

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Section: Discussionunclassified

“…Con este método no necesitamos la Kpost ni su estimación, no siendo necesaria la corrección doble-K en la fórmula de cálculo (20).…”

Section: G) Método Del Bypass Corneal De Walterunclassified

El cálculo de la lente intraocular tras cirugía foto-refractiva corneal: Revisión de la literatura

Mesa-Gutiérrez

Ruiz-Lapuente

2009

Arch Soc Esp Oftalmol

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“…2,[11][12][13][14] These methods include the clinical history method, 11 the Shammas refraction-derived corrected K value, 14 IOL power adjustment according to the amount of laser treatment, 2 the Feiz-Mannis method, 12 and a method that bypasses corneal power. 13 This variety however, is confusing. Additionally, there are drawbacks to each technique.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, such diversity can easily generate confusion rather than accuracy. In the present study, we present the outcomes of a simple method of IOL power calculation after refractive surgery and evaluate its accuracy in comparison with other commonly used methods, namely the clinical history, 11 Feiz-Mannis, 12 and corneal power bypassing 13 methods.…”

Section: Introductionmentioning

confidence: 99%

Intraocular lens power calculation after corneal refractive surgery

Feiz

Mannis

2004

Current Opinion in Ophthalmology

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Purpose: To report refractive outcomes following phacoemulsification (PE) and posterior chamber intraocular lens (PCIOL) implantation in eyes with previous corneal refractive surgery. Methods: In this retrospective comparative study, 18 consecutive eyes of 14 patients with previous keratorefractive surgery for myopia including photorefractive keratectomy (PRK, 6 eyes; 33.3%) and laser in situ keratomileusis (LASIK, 12 eyes; 66.7%) underwent PE+PCIOL. Computerized corneal topography was employed to determine the flattest keratometric reading within the 3-mm central zone. This value was inserted into the Sanders-Retzlaff-Kraff/T (SRK/T) formula to calculate IOL power. IOL power selected for implantation was 1 D greater than the calculated value described above. Results: Mean age and follow-up period were 54.1±11.5 years and 29.9±26.3 months, respectively. Mean implanted lens power was 18.56±3.86 D which was not significantly different from mean back-calculated IOL power for target refraction (19.04±4.16 D) (P=0.28). There was no significant difference between mean target refraction (-0.94±0.52 D) and achieved postoperative spherical equivalent refractive error (-0.62±1.06) at final follow-up (P=0.28). The achieved spherical equivalent refractive error was within ±0.50 D of intended refraction in 8 (44.4%) eyes, within ±1.0 D in 11 (61.1%) eyes, and within ±2.0 D in 16 (88.9%) eyes. In a subgroup of patients (5 eyes) with complete pre-refractive surgery data, the difference between post-refractive surgery keratometry method and all other methods (P=0.02) and between the current method and the Feiz-Mannis method (P=0.01) was statistically significant. Conclusion:The method suggested herein is simple and independent of pre-refractive surgery data with results comparable to other commonly used methods.

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“…Intraocular lens (IOL) power calculation after keratorefractive surgery has been a major challenge for the ophthalmic community and has generated numerous scholarly works and efforts trying to optimize current formulas and tailor new methods to better predict the correct intraocular lens (IOL) power [1][2][3][4][5][6][7][8]. Aramberri's work on the double-K adjustment of third-generation IOL formulas significantly improved the hyperopic results stemming from inaccurate estimation of the effective lens position by those formulas [9].…”

Section: Introductionmentioning

confidence: 99%

Intraocular Lens Power Calculation after Myopic Lasik with no revious Data: A Review of Available Methods

Mesa-Gutiérrez¹,

Rouras-López²,

Porta-Monnet³

et al. 2011

J Clinic Experiment Ophthalmol

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Accurate intraocular lens power calculation after myopic laser in situ keratomileusis, bypassing corneal power

Abstract: The new method of calculating IOL power after LASIK provided excellent results and the most accurate and precise results to date.

Cited by 93 publications

References 9 publications

El cálculo de la lente intraocular tras cirugía foto-refractiva corneal: Revisión de la literatura

El cálculo de la lente intraocular tras cirugía foto-refractiva corneal: Revisión de la literatura

Intraocular lens power calculation after corneal refractive surgery

Intraocular Lens Power Calculation after Myopic Lasik with no revious Data: A Review of Available Methods

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