兒童白内障術後散光及高階像差的初步分析

Preliminary findings of astigmatism and high order aberrations in children after cataract surgery

目的分析兒童白内障術後散光及高階像差的分佈。方法採用Topcon KR800全自動電腦驗光儀測量散光,Pentacam眼前節分析儀和GALILEI G4眼前節分析儀採集高階像差數據。結果研究對象:6名兒童(共9隻眼),平均年齡為8.33歲±3.8歲。隨訪時間平均6個月,平均等效球鏡度為-1.03±3.83D,平均總散光為-2.78±1.21D,平均角膜散光為-2.29±0.72D,總散光中順規散光佔88.9%,而在角膜散光中80%為逆規散光。最常見的高階像差是斜三葉草像差,平均值為-0.57±1.64μm,其後的是垂直三葉草像差(-0.23±0.85μm)和球面像差(-0.21±0.04μm)。高階像中第三階佔最多,其次是第五階和第四階,分別為51.92%、25.53%和22.55%。結論兒童白内障手術後,散光主要來自角膜散光,斜三葉草像差、垂直三葉草像差和球面像差是兒童白内障手術後主要的高階像差。

Objective To evaluate the distribution of astigmatism and high order aberrations(HOAs)in children after cataract surgery.Methods Refractive astigmatism was measured with the Topcon KR800 autorefractor;while HOAs were measured using Pentacam and GALILEI G4.Correlations between astigmatism and HOAs.Results 9 eyes of 6 subjects with a mean age of 8.33±3.8 years were studied.The average time of follow-up was 6 months.The mean spherical equivalent refractive error was-1.03±3.83D.The mean total astigmatism was-2.78±1.21 D;the mean corneal astigmatism was-2.29±0.72 D;and an 88.9%of rule astigmatism was found in total astigmatism.However,an 80%against-the-rule was found in corneal astigmatism.The most common higher-order aberration was oblique trefoil,with a mean value of-0.57±1.64μm,followed by vertical trefoil(-0.23±0.85μm)and spherical aberration(-0.21±0.04μm).The third order was the most common order of aberration,followed by the fifth and the fourth,its contribution to total HOA in descending order:51.92%for the third order,25.53%for the fifth order,and 22.55%for the fourth order aberrations.Conclusion Astigmatism mainly occurred from corneal astigmatism,oblique trefoil,vertical trefoil and spherical aberration are the predominant higher-order aberrations in children’s eyes that had undergone cataract surgery.