Correlations between Preoperative Angle Parameters and Postoperative Unpredicted Refractive Errors after Cataract Surgery in Open Angle Glaucoma (AOD 500)
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Purpose: To assess the accuracy of intraocular lens (IOL) power prediction for cataract surgery with open angle glaucoma (OAG) and to identify preoperative angle parameters correlated with postoperative unpredicted refractive errors. Materials and Methods: This study comprised 45 eyes from 45 OAG subjects and 63 eyes from 63 non-glaucomatous cataract subjects(controls). We investigated differences in preoperative predicted refractive errors and postoperative refractive errors for each group. Preoperative predicted refractive errors were obtained by biometry (IOL-master) and compared to postoperative refractive errorsmeasured by auto-refractometer 2 months postoperatively. Anterior angle parameters were determined using swept source opticalcoherence tomography. We investigated correlations between preoperative angle parameters [angle open distance (AOD); trabeculariris surface area (TISA); angle recess area (ARA); trabecular iris angle (TIA)] and postoperative unpredicted refractive errors. Results: In patients with OAG, significant differences were noted between preoperative predicted and postoperative real refractiveerrors, with more myopia than predicted. No significant differences were recorded in controls. Angle parameters (AOD, ARA, TISA, and TIA) at the superior and inferior quadrant were significantly correlated with differences between predicted and postoperativerefractive errors in OAG patients (-0.321 to -0.408, p<0.05). Superior quadrant AOD 500 was significantly correlated with postoperative refractive differences in multivariate linear regression analysis (β=-2.925, R2=0.404). Conclusion: Clinically unpredicted refractive errors after cataract surgery were more common in OAG than in controls. Certain preoperativeangle parameters, especially AOD 500 at the superior quadrant, were significantly correlated with these unpredicted errors.
Abstract
Purpose: To assess the accuracy of intraocular lens (IOL) power prediction for cataract surgery with open angle glaucoma (OAG) and to identify preoperative angle parameters correlated with postoperative unpredicted refractive errors. Materials and Methods: This study comprised 45 eyes from 45 OAG subjects and 63 eyes from 63 non-glaucomatous cataract subjects(controls). We investigated differences in preoperative predicted refractive errors and postoperative refractive errors for each group. Preoperative predicted refractive errors were obtained by biometry (IOL-master) and compared to postoperative refractive errorsmeasured by auto-refractometer 2 months postoperatively. Anterior angle parameters were determined using swept source opticalcoherence tomography. We investigated correlations between preoperative angle parameters [angle open distance (AOD); trabeculariris surface area (TISA); angle recess area (ARA); trabecular iris angle (TIA)] and postoperative unpredicted refractive errors. Results: In patients with OAG, significant differences were noted between preoperative predicted and postoperative real refractiveerrors, with more myopia than predicted. No significant differences were recorded in controls. Angle parameters (AOD, ARA, TISA, and TIA) at the superior and inferior quadrant were significantly correlated with differences between predicted and postoperativerefractive errors in OAG patients (-0.321 to -0.408, p<0.05). Superior quadrant AOD 500 was significantly correlated with postoperative refractive differences in multivariate linear regression analysis (β=-2.925, R2=0.404). Conclusion: Clinically unpredicted refractive errors after cataract surgery were more common in OAG than in controls. Certain preoperativeangle parameters, especially AOD 500 at the superior quadrant, were significantly correlated with these unpredicted errors.
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