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Article
December 1994

Comparison of Excimer Laser Treatment of Astigmatism and Myopia-Reply

Author Affiliations

Melbourne, Australia

Arch Ophthalmol. 1994;112(12):1510. doi:10.1001/archopht.1994.01090240015006

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Abstract

In reply  Lipshitz and colleagues have requested more information about the distribution of the magnitude of initial cylindrical error in our patients and about the effect of astigmatic treatment at 6 months. The preoperative distribution of cylindrical error in the 34 patients was 0.25 diopters of cylinder (DC) for three patients; 0.50 DC for four; 0.75 DC for nine; 1.00 DC for three; 1.25 DC for five; 1.50 DC for three; 1.75 DC for four; 2.50 DC for one; and 3.00 DC for two. Their redrawing of our Figure 4 makes comparison difficult as data from two patients overlap at each of seven data points. One should be cautious about the overinterpretation of the data contained in our Figure 4 because they provide only a simple comparison of the magnitude of cylindrical error and do not take into account the more complex vectoral changes. Vector analysis is required to more

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