الفهرس 
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Abstract
Background: There are several problems which affect the accuracy of the IOL power calculation. The two main problems encountered are the measurement of the proper axial length to be used in calculation, and the lack of accuracy of the available formulas that calculate the power of the intraocular lens in cases of high myopia. Methods: This study was carried out on 53 eyes of 51 patients with an axial length from 25.5 to 31.4 mm. including 21 males (41.2%) and 30 females (58.8%). Calculation of the IOL power to be implanted was done by three available IOL power formulas; Haigis formula, SRK/T formula, and Holladay formula. The mean error (ME) was calculated from the difference between the formula predicted refractive error and the actual post operative refractive error The patients were divided according to the axial length into three groups. Conclusion: There was no statistically significance difference between the mean error of the three formulas used in the overall performance or in the axial length subcategories. SRK/T formula caused the smallest mean error, (0.17 D). Haigis formula showed a higher ME (0.21D) and Holladay formula caused a myopic postoperative refractive error, (-0.20 D).