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ASSORT's univariate analysis of astigmatic vectors could be unpredictably incorrect and deceptive. Advised vector analyses includes double-angle plots with centroids and confidence ellipses of preoperative and postoperative astigmatism and also the forecast mistakes, along means and standard deviations among these vector magnitudes.ASSORT's univariate analysis of astigmatic vectors can be unpredictably incorrect and deceptive. Recommended vector analyses should include double-angle p