Intraocular lens power adjustment nomogram after laser in situ keratomileusis.
J Cataract Refract Surg
; 35(9): 1587-90, 2009 Sep.
Article
en En
| MEDLINE
| ID: mdl-19683157
ABSTRACT
PURPOSE:
To develop a nomogram for improving the accuracy of intraocular lens (IOL) power calculation at the time of cataract surgery based on the manifest refraction spherical equivalent (MRSE) change produced by laser in situ keratomileusis (LASIK).SETTING:
University-based clinical practice, Jules Stein Eye Institute, Los Angeles, California, USA.METHODS:
This was a retrospective review of the records of consecutive patients who had cataract surgery after LASIK. Spherical equivalent refractive data before and after LASIK and cataract surgery were recorded. The differences between the targeted postoperative refractive errors after cataract surgery and the achieved refractive errors were plotted against the LASIK-induced MRSE change, yielding postoperative refractive errors to target during IOL power calculation to achieve emmetropia.RESULTS:
Thirty-two eyes of 23 patients were identified; 25 eyes had myopic LASIK and 7, hyperopic LASIK. Regression analysis yielded the following polynomial relationship target postoperative refractive error (D) to achieve emmetropia during IOL power calculation = -0.018(MRSE Change)(2) + 0.192(MRSE Change) - 0.062. The outcomes in 97% of eyes fell within +/-1.00 D of the value predicted by this formula.CONCLUSIONS:
A 2nd-order polynomial relationship was found between LASIK-induced MRSE change and the MRSE error after cataract surgery. From this equation, a simple adjustment nomogram was generated and put into a look-up table format. The formula and nomogram should improve IOL power calculation accuracy in post-LASIK eyes when the MRSE change is known.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Refracción Ocular
/
Córnea
/
Queratomileusis por Láser In Situ
/
Nomogramas
/
Óptica y Fotónica
/
Hiperopía
/
Lentes Intraoculares
/
Miopía
Tipo de estudio:
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Límite:
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
J Cataract Refract Surg
Asunto de la revista:
OFTALMOLOGIA
Año:
2009
Tipo del documento:
Article
País de afiliación:
Estados Unidos