Comparabilidad del autorrefractómetro portátil Retinomax K-plus 3 en modo rápido versus autorrefractómetro de sobremesa en modo estándar / Comparability of the Retinomax K-plus 3 handheld autorefractometer in quick mode versus on-table autorefractometer in standard mode

I ntroducción Este estudio analiza la comparabilidad de las medidas tomadas por un autorefractómetro portátil Retinomax K-plus 3 en modo Quick (rápido) y un autorrefractómetro de sobremesa Topcon KR-800 en modo estándar sobre la población pediátrica, y establece su correlación. Método Es un estudio comparativo retrospectivo. Se midieron las variables potencia dióptrica esférica (SPH), potencia dióptrica cilíndrica (CYL), ángulo del eje cilíndrico (AX) y equivalente esférico (SE) con el Retinomax en modo Quick y con el Topcon en modo estándar. Cada paciente fue evaluado en condiciones ciclopléjicas y no ciclopléjicas por ambos autorefractómetros. Se realizó la prueba t de Student entre ambos instrumentos para SPH, CYL y SE. Se calculó el coeficiente de correlación de Pearson y se representó la dispersión mediante gráficas de Bland-Altman, evaluándose también el subgrupo de pacientes menores de 4 años. Se realizó un análisis descriptivo de los porcentajes de medidas que diferían. Resultados Incluyó 98 ojos de 49 sujetos (rango de edad: 3-16 años). Los datos de SPH sin cicloplejia son prácticamente idénticos, mientras que con cicloplejia hay un sesgo hipermetrópico de +0,5 dioptrías medidas con Retinomax. Los resultados de CYL son muy similares con y sin cicloplejia. Existe una gran correlación de Pearson para ambos instrumentos (>0,91) y un bajo grado de dispersión en los gráficos de Bland-Altman bajo cicloplejia. Conclusión Los datos del Retinomax fueron consistentes con los obtenidos por el Topcon. El Retinomax es un instrumento útil para detectar errores de refracción en niños de entre 3 y 16 años (AU)

Introduction This study analyzes the comparability of measurements taken by a Retinomax K-plus 3 handheld autorefractometer in quick mode and a Topcon KR-800 on-table autorefractometer in standard mode on the pediatric population, and establishes their correlation. Methods It is a retrospective comparative study. Spherical diopter power (SPH), cylindrical diopter power (CYL), angle of cylindrical axis (AX), and spherical equivalent (SE) were measured with the Retinomax in quick mode and with the Topcon in standard mode. Each patient was evaluated in cycloplegic and non-cycloplegic conditions by both autorefractometers. Student's t-test was performed between the two instruments for SPH, CYL, and SE. The Pearson correlation coefficient was calculated and the dispersion was represented using Bland-Altman graphs, also evaluating the subgroup of patients under 4 years of age. A descriptive analysis of the percentages of measures that differed was performed. Results It included 98 eyes of 49 subjects (age range: 3-16 years). The data for HPS without cycloplegia are virtually identical, whereas with cycloplegia there is a hyperopic bias of +0.5 diopters measured with Retinomax. CYL results are very similar with and without cycloplegia. There is a high Pearson correlation for both instruments (>0.91) and a low degree of dispersion in the Bland-Altman plots under cycloplegia. Conclusion The Retinomax data were consistent with those obtained by Topcon. The Retinomax is a useful instrument for detecting refractive errors in children between 3 and 16 years of age (AU)

Comparability of the Retinomax K-plus 3 handheld autorefractometer in quick mode versus on-table autorefractometer in standard mode.

INTRODUCTION: This study analyzes the comparability of measurements taken by a Retinomax K-plus 3 handheld autorefractometer in Quick mode and a Topcon KR-800 on-table autorefractometer in standard mode on the pediatric population, and establishes their correlation. METHODS: It is a retrospective comparative study. Spherical diopter power (SPH), cylindrical diopter power (CYL), angle of cylindrical axis (AX), and spherical equivalent (SE) were measured with the Retinomax in Quick mode and with the Topcon in standard mode. Each patient was evaluated in cycloplegic and non-cycloplegic conditions by both autorefractometers. Student's t-test was performed between the two instruments for SPH, CYL, and SE. The Pearson correlation coefficient was calculated and the dispersion was represented using Bland-Altman graphs, also evaluating the subgroup of patients under 4 years of age. A descriptive analysis of the percentages of measures that differed was performed. RESULTS: It included 98 eyes of 49 subjects (age range: 3-16 years). The data for HPS without cycloplegia are virtually identical, whereas with cycloplegia there is a hyperopic bias of +0.5 diopters measured with Retinomax. CYL results are very similar with and without cycloplegia. There is a high Pearson correlation for both instruments (>0.91) and a low degree of dispersion in the Bland-Altman plots under cycloplegia. CONCLUSION: The Retinomax data were consistent with those obtained by Topcon. The Retinomax is a useful instrument for detecting refractive errors in children between 3 and 16 years of age.

El efecto del uso prolongado y nocturno de las lentes de contacto en la córnea. A propósito de un caso de descompensación corneal y descenso del recuento endotelial / The effect of prolonged and nocturnal use of contact lenses on the cornea: About a case of corneal decompensation and decreased endothelial count

El edema corneal y la disminución del recuento de células endoteliales son complicaciones relacionadas con la hipoxia crónica de bajo grado, que experimentan los usuarios de lentes de contacto, principalmente debido al uso prolongado y nocturno. Este caso muestra el ejemplo de un paciente que presenta problemas de visión borrosa en ambos ojos, y a quien se le realizó un examen oftalmológico completo que incluyó fotografías, topografía corneal y conteo de células endoteliales. Posteriormente se revisa el metabolismo corneal, la etiopatogenia y las complicaciones derivadas del uso de lentes de contacto (AU)

Corneal edema and decreased endothelial cell count are complications related to chronic low-grade hypoxia experienced by contact lens wearers, primarily due to prolonged and overnight wear. This case shows the example of a patient who has blurred vision problems in both eyes and who underwent a complete ophthalmologic examination that included photographs, corneal topography and endothelial cell count. Subsequently, the corneal metabolism, the etiopathogenesis and the complications derived from the use of contact lenses are reviewed (AU)

The effect of prolonged and nocturnal use of contact lenses on the cornea: about a case of corneal decompensation and decreased endothelial count.

Corneal edema and decreased endothelial cell count are complications related to chronic low-grade hypoxia experienced by contact lens wearers, primarily due to prolonged and overnight wear. This case shows the example of a patient who has blurred vision problems in both eyes and who underwent a complete ophthalmologic examination that included photographs, corneal topography and endothelial cell count. Subsequently, the corneal metabolism, the etiopathogenesis and the complications derived from the use of contact lenses are reviewed.

Repetibilidad y comparabilidad de un nuevo tomógrafo con tecnología SS-OCT en biometría óptica / Repeatability and comparability of a new swept-source optical coherence tomographer in optical biometry

Objetivo Evaluar la reproducibilidad en la medición de los parámetros biométricos utilizando un nuevo biómetro por tomografía de coherencia óptica con fuente de barrido y compararlo con un biómetro por reflectometría óptica de baja coherencia. Diseño Estudio observacional, descriptivo, de corte transversal. Método Se incluyeron 45 ojos derechos de 45 pacientes, a los que se realizó tres mediciones consecutivas con el biómetro Anterion y una con el biómetro Lenstar LS900. Se recogieron las siguientes variables: longitud axial (AXL), profundidad de cámara anterior (ACD), K plana (K1), K curva (K2), grosor corneal central (CCT), grosor del cristalino (LT) y distancia blanco-blanco (WTW). Para evaluar la repetibilidad se calculó el coeficiente de Pearson «R» y la desviación estándar intrasujeto (Sw). Para evaluar la comparabilidad entre los biómetros se utilizó el coeficiente de correlación de concordancia (CCC) y el coeficiente de correlación intraclase (CCI). Además, se realizaron gráficos de Bland-Altman para cada variable. Resultados El coeficiente de Pearson fue excelente y estadísticamente significativo en la evaluación de la repetibilidad para todas las variables. Los valores más altos fueron 0,987 (AXL), 0,983 (CCT) y 0,942 (ACD). No hubo diferencias estadísticamente significativas entre las repetidas mediciones con Anterion para todas las variables. Los valores de CCC y CCI fueron excelentes en la evaluación de las variables AXL, CCT y ACD, y fueron altos para las variables K1, K2, LT y WTW. Conclusiones La realización de una biometría óptica ocular con el biómetro SS-OCT Anterion es un procedimiento reproducible y comparable con el biómetro Lenstar LS900 (AU)

Purpose To evaluate the reproducibility in the measurement of ocular biometric parameters using a new swept-source optical coherence tomographer and its comparability with an optical low coherence reflectometry biometer. Design An observational, descriptive, cross-sectional study. Methods 45 right eyes of 45 patients diagnosed with cataract were included. Three successive biometric measurements with Anterion and one with Lenstar LS900 were performed on each patient. The following variables were collected: axial length (AXL), anterior chamber depth (ACD), flat K (K1), steep K (K2), central corneal thickness (CCT), lens thickness (LT) and white-to-white distance (WTW). The intrasubject standard deviation (Sw) and the coefficient of Pearson «R» were calculated in order to assess the repeatability. The intraclass correlation coefficient (ICC) and the concordance correlation coefficient (CCC) were obtained to evaluate the comparability between devices. A Bland–Altman plot was performed for each variable. Results The coefficient of Pearson was excellent and statistically significant in the evaluation of the repeatability in all the variables. The highest values were 0.987 (AXL), 0.983 (CCT) and 0.942 (ACD). There were no statically significant differences between repeated measurements with Anterion in all the parameters. The ICC and CCC were excellent in the evaluation of AXL, CCT and ACD, and were also good in regard to K1, K2, LT and WTW. Conclusions Performing biometry with the SS-OCT Anterion is a reliable and reproducible procedure, and it is comparable with the Lenstar LS900 (AU)

Repeatability and comparability of a new swept-source optical coherence tomographer in optical biometry.

PURPOSE: To evaluate the reproducibility in the measurement of ocular biometric parameters using a new swept-source optical coherence tomographer and its comparability with an optical low coherence reflectometry biometer. DESIGN: An observational, descriptive, cross-sectional study. METHODS: 45 right eyes of 45 patients diagnosed with cataract were included. Three successive biometric measurements with Anterion and one with Lenstar LS900 were performed on each patient. The following variables were collected: axial length (AXL), anterior chamber depth (ACD), flat K (K1), steep K (K2), central corneal thickness (CCT), lens thickness (LT) and white-to-white distance (WTW). The intrasubject standard deviation (Sw) and the coefficient of Pearson "R" were calculated in order to assess the repeatability. The intraclass correlation coefficient (ICC) and the concordance correlation coefficient (CCC) were obtained to evaluate the comparability between devices. A Bland-Altman plot was performed for each variable. RESULTS: The coefficient of Pearson was excellent and statistically significant in the evaluation of the repeatability in all the variables. The highest values were 0.987 (AXL), 0.983 (CCT) and 0.942 (ACD). There were no statically significant differences between repeated measurements with Anterion in all the parameters. The ICC and CCC were excellent in the evaluation of AXL, CCT and ACD, and were also good in regard to K1, K2, LT and WTW. CONCLUSIONS: Performing biometry with the SS-OCT Anterion is a reliable and reproducible procedure, and it is comparable with the Lenstar LS900.