Clinical Study Of IOL Master For Measurements Of Axial Length And Corneal Curvature Before And After Removal Of Silicone Oil

Objective:To compare the accuracy of axial length and corneal curvature obtained with IOL Master to other commonly used devices before and after removal of silicone oil, and to evaluate the characteristics of their clinical application.Methods:A total of 34 eyes of 34 patients that had undergone crystalline lens extraction and vitrectomy with silicone oil tamponade in our department. The axial length (AL) was measured by A-scan and IOL Master, and the corneal curvatrue was measured by keratometry and IOL Master before and after removal of silicone oil, respectively.Results:The AL before removal of silicone oil was 24.18±2.11 mm measured by IOL Master and 32.77±3.41 mm by A-scan. The AL after removal of silicone oil was 24.12±1.98 mm measured by IOL Master and 24.33±2.03 mm by A-scan. For the AL, there were no significant differences between IOL Master preoperative and postoperative measurement (P=0.369, >0.05), and no significant differences between IOL Master and A-scan postoperatively (P=0.062,>0.05). However, there were significant differences between A-scan preoperative and postoperative measurement (P<0.01), and significant differences between IOL Master and A-scan preoperatively (P<0.01). The corneal curvatrue before removal of silicone oil was 42.81±2.41 diopters by IOL Master and 42.46±2.13 diopters by keratometry. The corneal curvatrue after removal of silicone oil was 42.89±2.32 diopters by IOL Master and 42.55±2.12 diopters by keratometry. There were no significant differences between the two methods for the keratometry both before and after removal of silicone oil. Ninty-five percent limits of agreement were-2.49 to 1.79 diopters before removal of silicone oil, and-2.37 to 1.69 diopters after removal of silicone oil. The mean interdevice differences in corneal curvatrue for the keratometry vs IOL Master before and after removal silicone oil were-0.35 diopters and-0.34 diopters, respectively.Conclusions:The AL values obtained with the IOL Master are more accurate than A-scan in supine position, and the corneal curvatrue values obtained with the IOL Master are more accurate than keratometry before and after removal of silicone oil.