Prospective evaluation of factors associated with post-LASIK corneal birefringence with scanning laser polarimetry.
J Glaucoma
; 16(1): 137-45, 2007 Jan.
Article
en En
| MEDLINE
| ID: mdl-17224764
ABSTRACT
PURPOSE:
To identify factors that affect corneal birefringence, such as the corneal polarization axis (CPA) and corneal polarization magnitude (CPM), after laser in situ keratomileusis (LASIK) using scanning laser polarimetry with a variable corneal polarization compensator.METHODS:
The CPA and CPM from 42 patients (42 eyes) who underwent LASIK and 24 normal untreated subjects (24 eyes) were measured 1 week before and 1 week after LASIK. Changes in the CPA and CPM after LASIK were studied using Student t test and Pearson correlation coefficient.RESULTS:
In the LASIK group, the post-LASIK CPA and CPM significantly changed, whereas both values did not change in normal subjects. Among 5 candidate factors [preoperative CPA (pre-CPA), preoperative CPM (pre-CPM), age, change in corneal curvature, and ablation depth], the change in CPA was significantly correlated with the pre-CPA (r=-0.793) and pre-CPM (r=0.339). The change in CPM was correlated with the pre-CPA (r=-0.455) and pre-CPM (r=-0.411). Over 83% case of postoperative corneal birefringence can be explained by only 2 parameters with regression analysis.CONCLUSIONS:
The pre-CPA and pre-CPM are strongly associated with LASIK-induced changes in CPA and CPM. Variations in age, changes in corneal curvature, and ablation depth do not contribute to changes in either parameter.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Birrefringencia
/
Córnea
/
Queratomileusis por Láser In Situ
/
Técnicas de Diagnóstico Oftalmológico
Tipo de estudio:
Clinical_trials
/
Diagnostic_studies
/
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Límite:
Adolescent
/
Adult
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
J Glaucoma
Asunto de la revista:
OFTALMOLOGIA
Año:
2007
Tipo del documento:
Article
País de afiliación:
Japón