Spherical aberrations of human astigmatic corneas.
J Refract Surg
; 27(11): 846-8, 2011 Nov.
Article
en En
| MEDLINE
| ID: mdl-22045577
ABSTRACT
PURPOSE:
To evaluate whether the average spherical aberration of human astigmatic corneas is statistically equivalent to human nonastigmatic corneas.METHODS:
Spherical aberrations of 445 astigmatic corneas prior to laser vision correction were retrospectively investigated to determine Zernike coefficients for central corneal areas 6 mm in diameter using CTView (Sarver and Associates). Data were divided into groups according to cylinder power (0.01 to 0.25 diopters [D], 0.26 to 0.75 D, 0.76 to 1.06 D, 1.07 to 1.53 D, 1.54 to 2.00 D, and >2.00 D) and according to age by decade. Spherical aberrations were correlated with age and astigmatic power among groups and the entire population. Statistical analyses were conducted, and P<.05 was considered statistically significant.RESULTS:
Mean patient age was 42.6±11 years. Astigmatic corneas had an average astigmatic power of 0.78±0.58 D and mean spherical aberration was 0.25±0.13 µm for the entire population and approximately the same (0.27 µm) for individual groups, ranging from 0.23 to 0.29 µm (P>.05 for all tested groups).CONCLUSIONS:
Mean spherical aberration of astigmatic corneas was not correlated significantly with cylinder power or age (P>.05). Spherical aberrations are similar to those of nonastigmatic corneas, permitting the use of these additional data in the design of aspheric toric intra-ocular lenses.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Astigmatismo
/
Córnea
/
Aberración de Frente de Onda Corneal
Tipo de estudio:
Observational_studies
/
Risk_factors_studies
Límite:
Adult
/
Aged
/
Humans
/
Middle aged
Idioma:
En
Revista:
J Refract Surg
Asunto de la revista:
OFTALMOLOGIA
Año:
2011
Tipo del documento:
Article
País de afiliación:
Estados Unidos