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Paper Details

RELACIN ENTRE EL A/CA MEDIDO CON EL MTODO DEL GRADIENTE Y EL DE LAS HETEROFORIAS EN PEREIRA

Alejandro Len lvarez, Csar Augusto Pulgarn

Journal Title:Investigaciones ANDINA
Abstract


Introduction: This study looks forward showing the average values and the correlation of the reason A/CA throughout the evaluation with the gradient and the heterophorias. The rough A/CA found with the gradient and heterophorias method were 1:3.15 and 1:4.89 respectively. Methods: The A/CA was calculated with the gradient method, using lenses of +100, - 100, -200 and -3.00 dioptre. To measure the habitual and the induced heterophorias we used the Von Graefe method with Risley prisms in the foropter and a row of letters was laid and subtending one AV to VL of 20/40 and near (0.4m) of 20/30 in the rotochart. The interpupilar distance was evaluated for averted vision, using a UV light source located 40 cm and centering the measurer with the first Purkinge image for every eye. Results: The A/CA correlation evaluated with both was 0.162 (Spearman), and with the first technique among the different stimulating lenses was better between 2.00 and 3.00 D (r = 0.771) and less efficient with 1.00 and 1.00 D (r =0.149). The average interpupilar distance was 60 mm and the correlation with the A/CA Heterophorias was very deficient (r= 0.292). Conclusions: We found lower average values than the ones stated in the literature with both techniques; low correlation between the two methods and variability among the results with the gradient, when using different stimulating lenses; the less value found with the Heterophorias method is due to the less interpupilar distance.

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