| Objection 1.To study the refractive error of PACG patients after phacotrabeculectomy 2.To analyze the related factors of refraction results of PACG patients after phacotrabeculectomy,as well as the changes of related biological parameters between preoperative and postoperative,such as axial length,keratometric power,and anterior chamber depth.Methods 51 PACG patients underwent phacotrabeculectomy in the eye Center of the second hospital of Jilin University were enrolled.All patients underwent comprehensive optometry before surgery.AL-scan was used to measure the preoperative axial length,keratometric power,anterior chamber depth,and the SRK-T formula of AL-scan software was used to calculate the IOL power and predict the refractive outcome.At the same time,the reserved refraction of all patients were recorded.At 3 months after operation,the axial length,keratometric power and anterior chamber depth were measured with AL-scan.The results of optometry of 3 months after surgery are taken as the actual refractive results(expressed by spherical equivalent),the actual refractive results minus the reserved refractive results before surgery is the refractive error,and the absolute value of the refractive error is the absolute refractive error.RE <-0.5D considers myopia error group,RE > 0.5D considers hyperopia error group,and-0.5D < RE < 0.5D considers non refraction error group.Results 1.Refractive error: the mean absolute refractive error was 0.82 D ± 0.78 D in 3 months after operation,including myopia error in 11 cases(21.57%),mean error of-1.56 D ± 1.03 D,no refractive error in 21 cases(41.18%),mean error of-0.01 D ± 0.30 D,hyperopia error in 19 cases(37.25%),mean error of 1.02 D ± 0.59 D.2.refractive error in patients with normal intraocular pressure(< 21 mm Hg)and high intraocular pressure(> 21 mm Hg): in the normal intraocular pressure group,there were 4 patients with myopia error(16.7%),3 patients with hyperopia error(12.5%),17 patients without refractive error(70.8%);in the high intraocular pressure group,there were 7 patients with myopia error(25.9%),16 patients with hyperopia error(59.3%),and 4 patients without refractive error(14.8%).3.Comparison of preoperative biological parameters between myopia group and hyperopia error group: the average anterior chamber depth of myopia group was 2.04 mm ± 0.19 mm and the average anterior chamber depth was 1.67 mm ± 0.36 mm in hyperopia error group,the difference between the hyperopia error group and the myopia error group was statistically significant(t=3.226,P=0.03<0.05);the mean axial length was 22.79 mm ± 0.51 mm in myopia error group,21.74 mm ± 0.58 mm in hyperopia error group,the difference between hyperopia error group and myopia error group was statistically significant(t=4.993,P = 0.000 < 0.05);the average keratometric power was 44.46 D ± 1.54 D in myopia error group,45.13D±1.53 D in hyperopia error group,there was no significant difference between hyperopia error group and myopia error group(t=-1.143,P=0.263>0.05).4.Comparison of biological parameters between preoperation and postoperation: the preoperative average anterior chamber depth was 1.76 mm ± 0.42 mm,and the postoperative average anterior chamber depth was 3.65 mm ± 0.36 mm,the difference was statistically significant(t =-27.155,P = 0.000 < 0.05);The preoperative average axial length was 22.05 mm ± 0.61 mm and postoperative was 21.93 mm ± 0.60 mm,the difference was statistically significant(t = 2.208,P = 0.044 < 0.05);The preoperative keratometric power was 44.43D±1.53 D and postoperative was 44.41 D±1.56 D,the difference was not statistically significant(t=0.488,P=0.627>0.05).5.Correlation between postoperative refractive error and preoperative biological parameters: postoperative refractive error was negatively correlated with preoperative anterior chamber depth(r =-0.32,P = 0.023 < 0.05),and negatively correlated with preoperative axial length(r =-0.52,P = 0.000 < 0.05).There was no significant correlation with preoperative keratometric power(P = 0.101 > 0.05)Conclusion 1.When using SRK-T formula to predict the postoperative refractive outcome of patients with PACG,The refractive outcome tend to hyperopia refractive error,and the shallower the depth of anterior chamber,the shorter the axial length,the refractive outcome more likely tend to hyperopia after phacotrabeculectomy.2.Compared with normal intraocular pressure,PACG patients with high intraocular pressure more refractive error occur,and most of them are hyperopia refractive error.3.PACG after phacotrabeculectomy in 3 months,the depth of anterior chamber was deeper,the length of axis was shorter and the keratometric power was not changed. |
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