Residual spherical defects. Differences between the dioptric values of the lens before and after cataract surgery
Keywords:
residual spherical defects; intraocular lens; tunneled technique for the extracapsular extraction of the crystalline, described by Blumenthal., spherical defects, intraocular lens, extracapsular extractionAbstract
Introduction: In cataract surgery, the spherical or astigmatic defect resulting from the operation is called a residual refractive defect.
Objective: To evaluate the magnitude of the differences between the dioptric value of the lens calculated in the preoperative stage and the value it should have according to the residual spherical defect.
Methods: A prospective longitudinal descriptive observational study was carried out in 195 eyes of patients operated consecutively between 2009 and 2011 for senile cataract with a polymethylmethacrylate intraocular lens implant. The following variables were evaluated: residual spherical defect and characteristics of the eye (preoperative and postoperative astigmatism measured by keratometry, axial length). The preoperative and postoperative dioptric power calculation was performed.
Results: We describe the magnitude of the different refractive defects and the differences between the estimated intraocular lens and the one that should have been implanted to achieve emmetropia in 195 patients with a correlation coefficient equal to 0.87. The spherical myopic defect occurs in most patients.
Conclusions: There are differences of magnitude between the dioptric value of the lens calculated in the preoperative and the one it should have according to the residual spherical defect, which accentuates the need to improve the methods of calculation of the lens in the preoperative period. The high correlation between the dioptric value of the lens estimated before and the one calculated afterwards indicates that this knowledge could be used to correct the calculation of the lens in the preoperative, and thus obtain smaller deviations in the future.
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