Performance of Random Dot stereoscopic test with Lea Symbols

Abstract

The stereopsis test reports on the quality of the patient’s binocular vision and provides guidance on the existence and severity of binocular suppressions. <em><strong>Objective:</strong></em> To determine the sensitivity and specificity of the Random Dot test with Lea symbols in preschool children from the city of Bucaramanga, between August 2009 and April 2010. Methodology: The tests were applied to 349 children. The Randot® Preschool stereoscopic test was used as reference, confronted with the new Random Dot test with Lea symbols. Two clinical observers were responsible for performing a different test each. <em><strong>Results:</strong></em> A sensitivity of 79.31 % and a specificity of 80 % were observed for the Random Dot Test with Lea Symbols. Positive Predictive Value (PPV): 26.44 %; Negative Predictive Value (NPV): 97.7 %. Conclusions: The Random Dot test with Lea symbols does not represent a reliable value to use as single visual screening test for the detection of binocular vision disturbances. The low prevalence (8.31 %) of the condition in this study increases its NPV. This, together with its high specificity, makes the test very efficient when it comes to confirming the likelihood of not having the disorder when a different test has already classified it with normal results.