Analysis Of Postoperative Refractive Error In Age-related Cataract Patients With Short Axial Length

Objective:To compare the accuracy of Haigis formula and Hoffer Q formula in postoperative refractive error of short-axis age-related cataract patients,and to explore the influence of preoperative biological parameters on postoperative refractive error.Methods:In this study,64 patients(72 eyes)who were diagnosed with age-related cataract in Huizhou Central People’s Hospital from January 2017 to December 2020 were selected.All patients have completed the phacoemulsification with intraocular lens implantation in the hospital.A-scan ultrasonography and IOL-Master should be used in measuring preoperative ocular biological parameters,including axial length(AL),anterior chamber depth(ACD)and lens thickness(LT)and Keratometry mean(Km),and the standard logarithmic visual acuity chart and Topcon refractometer should be used to measure the pre-and postoperative refractive status and some related parameters,including uncorrected visual acuity(UCVA),best corrected visual acuity(BCVA),spherical(Sph)and cylindircal(Cyl)degree.Haigis and Hoffer Q IOL formula were used to predict IOL diopter(D).Actual diopter and refractive status were recorded and counted.The prediction accuracy of Haigis and Hoffer Q calculation formulas was compared and related factors affecting the accuracy of the formulas were analyzed.SPSS23.0data packet was used for statistical analysis of all the data.Nonparametric test was used for comparison between the two groups,and multivariate regression analysis was used for subgroup correlation analysis.P < 0.05 was considered statistically significant.The mean between the groups was compared by independent test of multiple samples.P < 0.008 was considered statistically significant.RESULTS:A total of 64 patients(72 eyes)with age-related cataract were selected,including 13 males and 59 females,with an average age of(59.00±13.00)years.The IOL diopter was predicted by Haigis and Hoffer Q formulas,respectively.UCVA and BCVA of all enrolled patients were significantly increased 1 month after surgery compared with those before surgery,with statistical significance(P < 0.05).The Mean error(ME)was-0.17±0.84 D,and The Mean of absolute refractive error(MAE)was 0.62±0.57 D when calculating The degree of intraocular lens using Haigis formula.The median absolute refractive error(Med AE)was 1.41 D,and the range of refractive error was 34.7% of ±0.25 D,55.5% of ±0.50 D,69.4% of ±0.75 D and 81.9% of ±1.00 D.Hoffer Q formula was used to calculate the degree of intraocular lens.The postoperative refractive error was-0.59± 0.86 D,MAE was 0.78± 0.68 D,and Med AE was 0.73 D.The range of refractive error was 23.6% of ±0.25 D,43.0% of ±0.50 D,and 58.3% of ±0.75 D.66.6%of ±1.00 D.There were statistically significant differences in ME,MAE and percentage of refractive error between the two groups(P < 0.05).Preoperative LT was negatively correlated with the formula accuracy of the two groups,showing that the greater the value of LT,the greater the refractive error(P < 0.05).Conclusion:The prediction effect of Haigis formula is better than that of Hoffer Q.Hoffer Q formula predicts the tendency of myopic ametropia in patients with short axis age-related cataract after surgery.In both formulations,the larger the preoperative LT value was,the smaller the refractive error was.The prediction of Haigis formula was more accurate when the patients with short axial length,thicker lens,and the shallow anterior chamber.