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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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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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