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—We agree in part with Dr Sommer's observation that the patients with greater than a 2-D error are unusual and that any remeasurement will typically yield more normal results. However, we also believe that our postoperative measurements reflect the actual (true) values, since they were repeated independently by two observers, were obtained with the patient in the pseudophakic state (as referenced in the article), and were not obtained until after the six-month period necessary for the refraction to stabilize following cataract surgery.Because of these factors, we believe that the percentage improvements for the 26 patients are representative and that 24 (92%) of these patients could have been identified preoperatively using our threshold of a 1-D difference between the Sanders-Retzlaff-Kraff and Binkhorst formulas.We agree that these percentage improvements may not be valid for the remaining 486 patients with less than a 2-D error because remeasurements were not
Holladay JT, Prager TC, Ruiz RS, Lewis JW, Rosenthal H. Calculations of Intraocular Lens Power-Reply. Arch Ophthalmol. 1986;104(9):1271. doi:10.1001/archopht.1986.01050210025003