“…In previous studies, anterior corneal surface asphericity showed variation in different types of ametropia. Myopes were more oblate and hyperopes were more prolate [20,21]. Contrasting these results, some studies show no significant correlation between corneal surface asphericity and spherical equivalence [22,23].…”
“…In previous studies, anterior corneal surface asphericity showed variation in different types of ametropia. Myopes were more oblate and hyperopes were more prolate [20,21]. Contrasting these results, some studies show no significant correlation between corneal surface asphericity and spherical equivalence [22,23].…”
“…They reported P values of 0.88 for emmetropes and 0.89 for hyperopes and myopes (Q value À0.12 and À0.11, respectively). Carney et al 25 (r 2 Z 0.076, P Z .0045) and Horner et al 26 (r 2 Z 0.08, P!.05) found a trend toward more positive Q values as the level of myopia increased. Mainstone et al 27 (r 2 Z 0.003, P Z .742), Atchison 28 (r 2 Z À0.008, P Z .962), and Budak et al 29 (P Z .208) found no relationship between corneal asphericity and refractive error.…”
Section: Corneal Surfaces In the Study Populationmentioning
There were high interindividual variations in the Q value. Thus, proper correction of spherical aberration with intraocular lenses (IOLs) requires sophisticated selection of the asphericity of IOL surfaces based on biometric data and individual corneal Q values.
“…El RC se obtuvo del mapa queratométrico, mientras que Q se calculó en la zona de 4,5 mm usando el Holladay Diagnostic Summary (4). En ambos casos el valor final se corresponde al promedio de tres medidas.…”
Section: Procedimientosunclassified
“…Existen numerosos estudios (longitudinales, trasversales y epidemiológicos) que tratan de ampliar los conocimientos sobre el desarrollo y progresión de los errores refractivos, centrándose en la relación entre los componentes oculares, la topografía corneal y en su papel en el desarrollo de la ametropía (1)(2)(3)(4). De la misma forma, también han cobrado interés las implicaciones en cirugía refractiva (5-7) o en la calidad óptica del ojo (8).…”
RESUMENObjetivo: Determinar la relación entre los diferentes componentes ópticos oculares y la emetropización en función de la longitud axial (LA). Métodos: Participaron 109 jóvenes universitarios divididos en cinco grupos según el error refractivo: emétropes, hipermétropes, miopes bajos, miopes moderados y miopes altos. La medida de los pará-metros intraoculares y el análisis de la topografía corneal se realizó mediante ultrasonografía y videoqueratoscopia respectivamente. Resultados: Se encontró una correlación estadísti-camente significativa entre la profundidad de la cámara anterior (PCA) y la LA en ojos con LA menor de 24 mm (r = 0,441; p < 0,001). Sin embargo en ojos con LA mayor no se encontró tal relación (r = 0,098; p = 0,527). El espesor del cristalino (EC) mostró una correlación inversa con la LA para los ojos con LA < 24 mm (r = 0,391; p < 0,001), siendo nula en el caso de ojos con LA ≥ 24 ARTÍCULO ORIGINAL ABSTRACT Purpose: To report the relationship between different optical ocular components and the influence of axial length on emmetropization. Methods: 109 young university students, divided into five groups, were enrolled in this study: emmetropes, hyperopes, low myopes, moderate myopes and high myopes. Intraocular parameters and topographic corneal analyses were performed by ultrasonography and videokeratoscopy respectively. Results: Anterior chamber depth and axial length were found to correlate significantly in eyes with axial lengths less than 24 mm (r = 0.441; p < 0.001) However this correlation was not found in eyes with longer axial lengths (r = 0.098; p = 0.527). Lens thickness showed an inverse correlation with axial length for shorter eyes (r = 0.391; p < 0.001), whereas any correlation in longer eyes was associated with moderate to high levels of myopia. Anterior corneal curvature only correlated, although weakly,
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