Clinical Study On Changes Of Macular Thickness In Cataract Patients With Different Axial Lengths After Phacoemulsification

Objective: To survey the changes of central fovea of macular thickness and bestcorrected visual acuity of patients with different axial lengths afterphacoemulsification.To analyze the correlation between central fovea of macularthickness after phacoemulsification and best corrected visual acuity.Methods:58eyes with cataract from33patients who were admitted from Mayto December in2011were chosen to study. According to the different axial lengths，they were divided into three groups:20eyes for group A, axial lengths≥22mm and＜26mm；23eyes for group B,axial lengths≥26mm and＜30mm;15eyes for group C, axiallengths≥30mm and＜34mm.All the data of central fovea of macular thickness wasmeasured by Optical coherence tomography(OCT) of preoperative and after one week,one month and three months of surgery was compared in-group and between-groups toanalyze the correlation between the central fovea of macular thickness and bestcorrected visual acuity.Results:(1)In group A, the central fovea of macular thickness after one month ofthe surgery increased than it did before surgery(P＜0.05). But there was no significantdifference of the central fovea of macular thickness after one week and three months ofsurgery(P＞0.05).In group B, the central fovea of macular thickness after one week andone month of surgery increased than it did before surgery(P＜0.05). But there was nosignificant difference of the central fovea of macular thickness after three months ofsurgery(P＞0.05).In group C, the central fovea of macular thickness after one week，onemonth and three months of surgery increased than it did before surgery(P＜0.05).(2)Comparing the increase of the central fovea of macular thickness of patientsbetween-groups,there was no significant difference before surgery(P＞0.05). The between-groups comparison of the central fovea of macular thickness after surgery: thecentral fovea of macular thickness of group B was thicker than that of group A after oneweek, one month and three months of surgery(P＜0.05); the central fovea of macularthickness of group C was thicker than that of group A after one week, one month andthree months of surgery(P＜0.05); the central fovea of macular thickness of group Cwas thicker than that of group B after one week, one month and three months ofsurgery(P＜0.05).(3)Cystoid macular edema appeared in two eyes of group B and oneeye of group C in one week after surgery. Cystoid macular edema of three eyes fromgroup B and group C got better after three months of surgery than it did after one weekand one month of surgery.(4)In group A, there was no correlation between the centralfovea of macular thickness and best corrected visual acuity after one month and threemonths of the surgery(r=-0.506，p＞0.05;r=0.185，p＞0.05).In group B, there was anegative correlation between the central fovea of macular thickness and best correctedvisual acuity after one month and three months of surgery (r=-0.892，p＜0.05;r=-0.872，p＜0.05). In group C,there was a negative correlation between the central fovea ofmacular thickness and best corrected visual acuity after one month and three months ofsurgery (r=-0.834，p＜0.05;r=-0.744，p＜0.05).Conclusion:(1)OCT is one of the most instrumental tools to measure the centralfovea of macular thickness.The paitents with different axial lengths have differentchanges of central fovea of macular thickness after cataract surgery.The longer the axiallength is,the thicker the central fovea of macular thickness is after surgery.(2)There is anegative correlation between the central fovea of macular thickness and best correctedvisual acuity after cataract surgery.