目的:探讨准分子激光原位角膜磨镶术(laser in situ keratom ileusis,LASIK)对近视及近视散光患者30°中心视野的影响。方法:将实施LASIK的近视患者45例89眼分为两组:中低度近视组和高度近视组。Ⅰ组:中低度近视组60眼,近视-1.50～-...目的:探讨准分子激光原位角膜磨镶术(laser in situ keratom ileusis,LASIK)对近视及近视散光患者30°中心视野的影响。方法:将实施LASIK的近视患者45例89眼分为两组:中低度近视组和高度近视组。Ⅰ组:中低度近视组60眼,近视-1.50～-6.00D;Ⅱ组:高度近视组29眼,近视-6.00～10.00D。用Humphrey视野计30-2SITA快速阈值检测程序对所有患者的术前、术后1wk;1,3,6mo的视野进行检查,观察其视野改变情况。观察指标为平均缺损(mean defect,MD)和模式标准差(pattern standard deviation,PSD)。统计学分析采用重复测量的方差分析和非参数分析的秩和检验,分析各时间点视野指数。结果:中低度近视组:术后1wk;1,3mo的MD与术前相比,差异有统计学意义(P<0.05),术后6mo时MD值与术前相比差异无统计学意义;PSD值术后各时间点与术前相比差异无统计学意义。高度近视组:术后1wk;1,3mo时的MD均较术前增加,并且随时间变化的差异有统计学意义(P<0.05);其中,1wk时MD值上升最明显,以后逐渐下降,但仍高于术前水平;术后6mo时恢复至术前水平(P>0.05);术后1wk时的PSD与术前相比差异有统计学意义(P<0.05),其余各时间点PSD值与术前相比差异无统计学意义。结论:LASIK手术对高度近视眼患者1wk的视野有影响,对中低度近视患者的视野改变无影响。展开更多
Normal yield tables for Larix gmelimii(Rupr) Rupr were constructed from 228 tem-porary sample plois.A normal stand was defined as having the maximum growh rate parameter,based on the theory of forest growth.Basal area...Normal yield tables for Larix gmelimii(Rupr) Rupr were constructed from 228 tem-porary sample plois.A normal stand was defined as having the maximum growh rate parameter,based on the theory of forest growth.Basal area growth curves were described with Richard’s equa-tion according to Von-Bertalanfy’s growth theory and allometric law.The growth rate parameterwas found to be K,so a normal stand had maximum K.Thus the basal area growth curve of a nor-mal stand was obtaied simply by increasing K.A normal yield table for L.gmelinii of Daxinganlingnatural forest was then constructed.展开更多
文摘目的:探讨准分子激光原位角膜磨镶术(laser in situ keratom ileusis,LASIK)对近视及近视散光患者30°中心视野的影响。方法:将实施LASIK的近视患者45例89眼分为两组:中低度近视组和高度近视组。Ⅰ组:中低度近视组60眼,近视-1.50～-6.00D;Ⅱ组:高度近视组29眼,近视-6.00～10.00D。用Humphrey视野计30-2SITA快速阈值检测程序对所有患者的术前、术后1wk;1,3,6mo的视野进行检查,观察其视野改变情况。观察指标为平均缺损(mean defect,MD)和模式标准差(pattern standard deviation,PSD)。统计学分析采用重复测量的方差分析和非参数分析的秩和检验,分析各时间点视野指数。结果:中低度近视组:术后1wk;1,3mo的MD与术前相比,差异有统计学意义(P<0.05),术后6mo时MD值与术前相比差异无统计学意义;PSD值术后各时间点与术前相比差异无统计学意义。高度近视组:术后1wk;1,3mo时的MD均较术前增加,并且随时间变化的差异有统计学意义(P<0.05);其中,1wk时MD值上升最明显,以后逐渐下降,但仍高于术前水平;术后6mo时恢复至术前水平(P>0.05);术后1wk时的PSD与术前相比差异有统计学意义(P<0.05),其余各时间点PSD值与术前相比差异无统计学意义。结论:LASIK手术对高度近视眼患者1wk的视野有影响,对中低度近视患者的视野改变无影响。
文摘Normal yield tables for Larix gmelimii(Rupr) Rupr were constructed from 228 tem-porary sample plois.A normal stand was defined as having the maximum growh rate parameter,based on the theory of forest growth.Basal area growth curves were described with Richard’s equa-tion according to Von-Bertalanfy’s growth theory and allometric law.The growth rate parameterwas found to be K,so a normal stand had maximum K.Thus the basal area growth curve of a nor-mal stand was obtaied simply by increasing K.A normal yield table for L.gmelinii of Daxinganlingnatural forest was then constructed.
