ABSTRACT
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Subject(s)
Humans , Myopia/epidemiology , Myopia/prevention & control , Atropine/administration & dosage , Disease Progression , Global Health , EpidemicsABSTRACT
BACKGROUND: The purpose of this study was to compare the accuracy of the new Sirius(®) Scheimpflug anterior segment examination device for measurement of central corneal thickness (CCT) and anterior chamber depth (ACD) with that of CCT measurements obtained by ultrasound pachymetry and ACD measurements obtained by ultrasound biometry, respectively. METHODS: CCT and ACD was measured in 50 right eyes from 50 healthy subjects using a Sirius Scheimpflug camera, SP100 ultrasound pachymetry, and US800 ultrasound biometry. RESULTS: CCT measured with the Sirius was 546 ± 39 µm and 541 ± 35 µm with SP100 ultrasound pachymetry (P = 0.003). The difference was statistically significant (mean difference 4.68 ± 10.5 µm; limits of agreement -15.8 to 25.20 µm). ACD measured with the Sirius was 2.96 ± 0.3 mm compared with 3.36 ± 0.29 mm using US800 ultrasound biometry (P < 0.001). The difference was statistically significant (mean difference -0.40 ± 0.16 mm; limits of agreement -0.72 to 0.07 mm). When the ACD values obtained using ultrasound biometry were corrected according to the values for CCT measured by ultrasound, the agreement increased significantly between both technologies for ACD measurements (mean difference 0.15 ± 0.16 mm; limits of agreement -0.16 to 0.45 mm). CONCLUSION: CCT and ACD measured by Sirius and ultrasound methods showing good agreement between repeated measurements obtained in the same subjects (repeatability) with either instrument. However, CCT and ACD values, even after correcting ultrasound ACD by subtracting the CCT value obtained with either technology should not be used interchangeably.
ABSTRACT
Objetivo: 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 parámetros intraoculares y el análisis de la topografía corneal se realizó mediante ultrasonografía y videoqueratoscopia respectivamente. Resultados: Se encontró una correlación estadísticamente 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 mm. La curvatura corneal (RC) sólo mostró una débil correlación con la profundidad de la cámara vítrea (PCV) en ojos con LA < 24 mm (r = 0,363; p < 0,003). Conclusión: Los parámetros ópticos del ojo humano se relacionan de distinta forma según el tamaño del ojo, encontrándose en los ojos más miopes una ausencia de coordinación entre los componentes ópticos oculares, que según los resultados de este estudio, es a partir de 2,00 D
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, with vitreous chamber depth for shorter eyes (r = 0.363; p < 0.003). Conclusion: Differences in optical parameters of the human eye displayed different associations in longer eyes. A lack of correlation was seen between ocular components in eyes with higher myopia, corresponding to myopia in excess of 2.00 D (Arch Soc Esp Oftalmol 2008; 83: 307-316)
Subject(s)
Humans , Male , Female , Adolescent , Adult , Students/statistics & numerical data , Refractive Errors/diagnosis , Refractive Errors/epidemiology , Corneal Topography/methods , Corneal Topography/statistics & numerical data , Tetracaine , Refractive Errors , Corneal Topography/classification , Corneal Topography/trends , Linear Models , Logistic Models , Hyperopia/epidemiologyABSTRACT
Caso clínico: Se presenta el caso de un paciente de 29 años afectado de queratocono posterior circunscrito en su ojo izquierdo. Después del examen ocular se analiza la morfometría corneal mediante videoqueratoscopia y paquimetría topográfica ultrasónica. La distribución de espesores corneales se representa mediante código de colores a partir de los 25 puntos evaluados (topografía paquimétrica).Discusión: La biomicroscopia muestra un área paracentral de moderado adelgazamiento con una concavidad posterior nasal-superior en la superficie corneal posterior. La paquimetría topográfica y la topografía paquimétrica permiten cuantificar dicho adelgazamiento y aportan datos útiles para el diagnóstico de esta rara distrofia corneal (AU)
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