5/18/2023 0 Comments Sensibilidad al contrasteAdemás, la precisión del examen visual puede mejorarse con el uso de un método psicofísico adecuado.Ĭontrast sensitivity function Desempeño visual Dispositivos de tableta EFAC FACT Función de sensibilidad al contraste Tablet devices Visual performance iPad.Ĭopyright © 2014 Spanish General Council of Optometry. La nueva aplicación ClinicCSF para el iPad retina no reflejó diferencias significativas con el test FACT al utilizar los mismos pasos de sensibilidad al contraste. Sin embargo, los intervalos de confianza del 95% para las diferencias medias entre ClinicCSF y FACT fueron inferiores para la versión que incorporó un método psicofísico de escalera ( ClinicCSF.v1), principalmente para frecuencias espaciales de 6, 12 y 18 cpg. La mejor concordancia con el FACT se obtuvo con el ClinicCSF.v2, no hallándose diferencias significativas en todas las frecuencias espaciales evaluadas. ![]() Se hallaron diferencias de FSC estadísticamente significativas en ambos grupos debido al cambio de versión del ClinicCSF (p < 0.05), mientras que no se manifestaron diferencias con el test FACT. Se representaron las concordancias entre ClinicCSF y FACT para frecuencias espaciales de 3, 6, 12 y 18 ciclos por grado (cpg) mediante gráficos de Bland–Altman. v2) para medir la FSC de cada grupo con el mismo iPad, comparándose los resultados obtenidos con los medidos con el test FACT. Se utilizaron diferentes versiones del ClinicCSF (.v1 y. ![]() Se distribuyeron 42 sujetos en dos grupos de 21 personas. Introducir una nueva aplicación ( ClinicCSF) para medir la Función de Sensibilidad al Contraste (FSC) con dispositivos de tableta, y compararla con el test Functional Acuity Contrast Test ( FACT). In addition, it is shown that the accurateness of a vision screening could be improved with the use of an appropriate psychophysical method. The new ClinicCSF application for iPad retina showed no significant differences with FACT test when the same contrast sensitivity steps were used. However, the 95% confidence intervals for mean differences between ClinicCSF and FACT were lower for the version which incorporated a staircase psychophysical method (ClinicCSF.v1), mainly for spatial frequencies of 6, 12 and 18 cpd. The best agreement with the FACT was found with the ClinicCSF.v2 with no significant differences in all the evaluated spatial frequencies. Statistically significant differences in CSF of both groups were found due to the change of the ClinicCSF version (p<0.05) while no differences were manifested with the use of the same FACT test. The agreements between ClinicCSF and FACT for spatial frequencies of 3, 6, 12 and 18 cycles per degree (cpd) were represented by Bland-Altman plots. v2) were used to measure the CSF of each group with the same iPad and the results were compared with those measured with the FACT. Different versions of the ClinicCSF (.v1 and. It is suggested that CS tests be included in their regular eye examination.To introduce a new application (ClinicCSF) to measure Contrast Sensitivity Function (CSF) with tablet devices, and to compare it against the Functional Acuity Contrast Test (FACT).Ī total of 42 subjects were arranged in two groups of 21 individuals. Conclusions: CS tests can detect visual disturbance in thalassemic patients before the impairment of visual acuity. No significant relationship was observed between CS values and duration of transfusion, serum ferritin concentration and dose of chelation therapy (P > 0.05). Comparing those who used deferasirox with healthy subjects, contrast threshold was higher in deferasirox group at all special frequencies (P > 0.05). Por tanto un paciente que necesite mucho contraste para poder distinguir un objeto presentar un valor de SC muy bajo y viceversa. ![]() LaSensibilidad al Contrastese define como la inversa del umbral al contraste. Results: In visual acuity tests, thalassemic patients did not have any problem. All data analysis was performed using SPSS, version 17. Contrast threshold was assessed with the use of Freiberg visual acuity and contrast test under the mesopic light condition for three frequencies 1, 5, 15 cpd. All subjects had a set of examinations including refraction, visual acuity, Biomicroscopy, ophthalmoscopy and CS. Methods: In this cross sectional study a total of 60 β-thalassemia patients (30 used deferoxamine and 30 used deferasirox) were regarded as case group and 30 age and sex matched healthy subjects were selected as control group. Purpose: To compare contrast sensitivity (CS) in multi-transfused β-thalassemia patients who received deferoxamine with those who received Osveral.
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