Error in Equation 1

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In the article titled "Correlation of Visual Field With Scanning Confocal Laser Optic Disc Measurements in Glaucoma, published in the September Archives (1995;113:1191-1194), equation 1 (in the boxed "Patients and Methods" section) was incorrectly composed. The subscript number 1 (next to the first "X" in parentheses) should have been an "i." Also, a bar should have appeared above the second "X" in parentheses.