Abstract

LEON ALVAREZ, Alejandro  and  PULGARIN, César Augusto. ARELATION BETWEEN THE A/CA MEASURED BY THE GRADIENT AND THE HETEROPHORIAS METHOD IN PEREIRA. Investig. andina [online]. 2008, vol.10, n.16, pp.32-43. ISSN 0124-8146.

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 frst Purkinge image for every eye. Results: The A/CA correlation evaluated with both was 0.162 (Spearman), and with the frst 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.

Keywords : Methods; Forias; Convergence; Ocular; Pupil Disorders.

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