| Objective: To evaluate the feasibility of selecting the ICL diameter by Sirius anterior segment analysis system,to provide a reference for the selection of an appropriate ICL diameter for future ICL implantation.Methods:A retrospective study was conducted to collect 47 patients(94 eyes)with high myopia undergoing ICL implantation in our hospital from January 2016 to August 2017.All ICL diameters were selected by the anterior segment indicators such as HVID,HACD,ACD,which was measured by the preoperative Sirius anterior segment analysis system.According to the ICL diameter,including 26 eyes with ICL of 12.1mm,58 eyes of 12.6mm,eyes of 13.2 mm accounts for 10 eyes.Follow-up on the 1st postoperative day,1 week postoperatively,1 month postoperatively,and 3m-1Y postoperatively.SPSS 23.0 was used for statistical analysis.A paired t-test was used in the measurement data set that obeys the normal distribution,and analysis of variance was used for comparison among multiple groups.Rank sum test was used for data that did not obey the normal distribution.The linear regression equation was used to analyze the correlation of the data,and the statistical F test was used to test whether the regression equation was statistically significant.Results: 1.All patients had higher uncorrected visual acuity(UCVA)and best corrected visual acuity(BCVA)than before surgery.The difference was statistically significant(P<0.05).The effective index and safety index were greater than 1 at each postoperative period.Spherical equivalent(SE): Postoperatively decreased compared with preoperative,the difference was statistically significant(P<0.05);there was no significant difference between the postoperative period(P>0.05).2.IOP: There was no significant difference in IOP between preoperative and postoperative follow-up(P>0.05).3.Related indicators of the anterior segment: corneal endothelium count,horizontal prehospital angle width,ACD were all decreased after surgery,and the difference was statistically significant(P<0.05).4.Vault: postoperative mean vault was(0.46±0.19)mm and ideal arch height accounted for 85.1%.5.Visual symptoms and complications: There were glare in 2 eyes and it was tolerable.There were no complications such as cataracts,antral adhesions,and glaucoma.6.Correlation analysis: With the increase of HVID,HACD,and ACD,the size of selected ICL increased,but there was no statistically significant difference in the vault between the groups(P<0.05).When the ICL models are 12.1mm,12.6mm,and 13.2mm,the HVID 95% confidence intervals are 11.30~11.56 mm,11.76~11.92 mm,and 12.19~12.35 mm,respectively,and the 95% confidence intervals for ACDs are 2.91~3.17 mm,3.25~3.36 mm,and 3.46~3.71 mm.7.There was a linear correlation between the ICL model and HVID,HACD,ACD,nasal angle width,and temporal width(P<0.05).8.Multiple linear equations related to ICL diameter: ICL diameter(mm)=4.43+0.429×HVID(mm)+0.212×HACD(mm)+0.009×nasal angle width(°).Conclusions: 1.The ICL selected by Sirius Anterior Segment Analysis System is safe,effective,and has good predictability in the treatment of high myopia;2.The HVID,HACD and ACD obtained by Sirius can be used as important parameters for ICL diameter selection;3.The regression equation obtained by the correlation analysis can be directly used for the calculation of the ICL diameter,providing a certain reference for selecting the ICL diameter in the future. |
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