Configuración del Pentacam en el tamizaje de cirugía refractiva / Pentacam configuration in refractive surgery screening

Objetivo: determinar la consistencia de la configuración manual del Pentacam en el tamizaje de cirugía refractiva. Métodos: se realizó un estudio observacional, descriptivo en el Instituto Cubano de Oftalmología Ramón Pando Ferrer durante el 2012. La muestra quedó conformada por 104 imágenes correspondiente a ojos examinados por el Pentacam que cumplieron los criterios de selección. Se analizaron variables tales como: diámetro para al cálculo de la esfera de mejor ajuste, elevación anterior, elevación posterior y se utilizó la clasificación de ectasias corneales según elevación anterior y posterior para agrupar la muestra. Resultados: del total de la muestra el 45,2 por ciento y el 54,8 por ciento utilizó un diámetro menor de 8 mm, y mayor de 8 mm para el cálculo de la esfera de mejor ajuste, respectivamente. La comparación de media de los dos grupos fue estadísticamente significativa. Según la clasificación de ectasia por elevación anterior y posterior, con un diámetro mayor de 8 mm se duplican en por ciento los exámenes normales y disminuyen los patológicos en un 25 porciento respectivamente. Existen diferencias entre las medias y la desviación estándar de los exámenes evolutivos a un mismo ojo según la configuración automática y manual. Conclusiones: la configuración manual del Pentacam permite tener una consistencia en el tamizaje de cirugía refractiva

Objective: to determine the consistency of manual Pentacam configuration in refractive surgery screening. Methods: observational and descriptive study performed at Ramon Pando Ferrer Cuban Institute of Ophthalmology during 2012. The sample was made up of 104 images of eyes examined by Pentacam equipment, which had met the selection criteria. The analyzed variables were diameter for best fit sphere calculation, anterior elevation, posterior elevation and the classification of corneal ectasias based on anterior and posterior elevations was used in order to group the sample. Results: in the sample, 45.2 percent and 54.8 percent used a diameter lower than 8mm and over 8mm for the calculation of the best fit sphere, respectively. The mean comparison between the two groups was statistically significant. According to the ectasia classification based on anterior and posterior elevations, with the over 8mm diameter, the normal exams doubled in some percentage and the pathological ones decreased by 25 percent, respectively. There are differences between the means and the standard deviations in evolutional exams performed in the same eye, considering the automatic and the manual configurations. Conclusions: manual configuration of Pentacam allows attaining consistency in the refractive surgery screening

Study on the short version of the BFS mood scale and its reliability and validity / 中华行为医学与脑科学杂志

ObjectiveTo provide a brief scale of mood measurement with satisfactory reliability and validity.MethodsThe 40-item BFS was abbreviated to a short-vcrsioncd BFS by item analysis.282 adult participants were surveyed by the brief BFS and NEO-FFI while NEO-FFI was taken as a criterion instrument.Reliability and validity of brief BFS were examined.ResultsThe brief BFS had 18 items including six dimensions ( activity,cheer,calmness,indignation,stir and depression),and the cronbach's α were 0.87,0.75,0.85,0.86,0.84 and 0.86 respectively and the retest reliability( r value) were 0.67,0.57,0.61,0.62,0.75 and 0.69 respectively.All the key fit indices of confirmatory factor analysis (CFA) of brief BFS were above 0.90.Besides,NEO-FFI had significant correlation with brief BFS.ConclusionThe brief BFS has satisfactory reliability and validity.

Corneal Topographic Study Using Orbscan II between Keratoconus and Keratoconus Suspect

PURPOSE: To compare corneal topographic changes using Orbscn II between keratoconus and keratoconus- suspected eyes. METHODS: Thirty-seven keratoconus eyes, 17 keratoconus-suspected eyes and 37 normal eyes were evaluated by using Orbscan II corneal topography. We compared central phachymetry, anterior elevation from best-fit sphere (BFS), posterior elevation from BFS, most protruded corneal thickness, central corneal thickness, anterior chamber depth, corneal diameter, and pupil size. RESULTS: Central pachymetry, anterior and posterior elevation from BFS, central corneal thickness, and anterior chamber depth were statistically significantly different between keratoconus and control eyes. Anterior elevation from BFS showed a significant difference between keratoconus-suspected and control eyes. There were statistically significant differences in central pachymetry, posterior elevation from BFS, central corneal thickness and most protruded corneal thickness between keratoconus and keratoconus-suspected eyes. Corneal diameter and pupil size showed no differences among the 3 groups. CONCLUSIONS: Suspected keratoconus eyes have a higher value of anterior elevation from BFS on Orbscan II topography as compared with control eyes. Central pachymetry, posterior elevation from BFS, central corneal thickness and most protruded corneal thickness may be helpful in distinguishing between keratoconus and keratoconus-suspected eyes.