Estudio comparativo de la agudeza visual tomada con el optotipo de Bailey Lovie y el optotipo de Snellen vs. angular de letras, en pacientes con ambliopía refractiva entre 5 y 12 años

In amblyopia diagnostic there is important to choose the visual chart to measure the visual acuity: morfoscopic or angular since due to the crowding phenomenon it turns out logical that it is easily to discriminate isolated characters than linear characters. Objective: to determination if there are significant difference between the visual acuity results measured up to the Snellen chart , Bailey Lovie chart and chart of isolated letters in patients with refractive amblyopia between 5 and 12 years. Materials and methods: there was realized a comparative study of the results of visual acuity, measured up to three charts in far vision in 20 patients (40 eyes) by confirmed diagnosis of refractive amblyopia between 5 and 12 years, at the Unit of Pediatric Optometry and visual Training of the Optometric Research Institute of LaSalle University in the period between February and April, 2007. Results: the Pearson’s coefficient of correlation shows a higher correlation between the visual acuity taked with isolated letter chart and Snellen chart (0,7200407) and the lowest correlation between the Snellen and Bailey Lovie’s charts (0,6425297). In the variance analysis, there were significative differences between the values of visual acuity of each chart (p 0.05). Conclusiones: existe una alta correlación, sin diferencias significativas, entre los resultados obtenidos con los optotipos angular de letras y Snellen, debido probablemente a que utilizan las mismas letras, lo que favorece la tasa de memorización. Existe un grado bajo de correlación y una diferencia significativa entre la agudeza visual obtenida con los optotipos de Bailey Lovie y angular de letras. La diferencia entre la agudeza visual angular y morfoscópica es determinante a la hora de tomar la agudeza visual con el fin de diagnosticar el fenómeno de amontonamiento