Intraocular lens power calculation in eyes with previous hyperopic laser in situ keratomileusis.
J Cataract Refract Surg
; 39(5): 739-44, 2013 May.
Article
em En
| MEDLINE
| ID: mdl-23608568
ABSTRACT
PURPOSE:
To establish a corneal correction equation for the Shammas post-hyperopic laser in situ keratomileusis (LASIK) (Shammas-PHL) formula and to evaluate its accuracy in cases with and without available pre-LASIK data.SETTING:
Private practices, Lynwood, California, and Mesa, Arizona, USA.DESIGN:
Retrospective comparative observational study.METHODS:
The corrected corneal power (Kc) was calculated in each eye by adding the refractive change at the corneal level to the pre-LASIK keratometric (K) readings. By comparing Kc with the measured post-LASIK K readings (Kpost), the following equation was derived Kc = 1.0457 Kpost-1.9538. This equation was combined with the Shammas original formula to obtain the Shammas-PHL formula.RESULTS:
The new formula was evaluated in 18 eyes with previous LASIK data and in 24 eyes with no previous LASIK data. Using the Shammas-PHL formula, the mean arithmetic prediction error was -0.03 diopter (D) ± 0.72 (SD) (range -1.57 to +1.54 D) and the median absolute error was 0.38 D in 18 eyes with available pre-LASIK data and 0.05 ± 0.58 D (range -0.56 to +1.40 D) and 0.43 D, respectively, in the 24 eyes with no pre-LASIK data.CONCLUSION:
The Shammas-PHL formula can be used in post-hyperopic LASIK cases whether or not the pre-LASIK data are available.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Biometria
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Facoemulsificação
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Córnea
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Implante de Lente Intraocular
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Ceratomileuse Assistida por Excimer Laser In Situ
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Hiperopia
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Lentes Intraoculares
Tipo de estudo:
Observational_studies
/
Risk_factors_studies
Limite:
Aged
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Female
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Humans
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Male
/
Middle aged
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article