目的探讨超声乳化白内障吸除术前后不同测量中心患者角膜参数的差异和一致性。方法选取2020年10月至2021年5月在潍坊眼科医院行超声乳化白内障吸除术及Pentacam检查的白内障患者共148例(148眼)。根据Pentacam测量模式“以角膜顶点为中...目的探讨超声乳化白内障吸除术前后不同测量中心患者角膜参数的差异和一致性。方法选取2020年10月至2021年5月在潍坊眼科医院行超声乳化白内障吸除术及Pentacam检查的白内障患者共148例(148眼)。根据Pentacam测量模式“以角膜顶点为中心”或“以瞳孔为中心”分为角膜顶点组和瞳孔中心组。术前及术后3个月,通过Pentacam测量手术前后以角膜顶点为中心和以瞳孔为中心2 mm、4 mm、6 mm圆环和区域模式下患者角膜前表面屈光力(ASF)、角膜真实净屈光力(TNP)和总角膜屈光力(TCRP);以角膜顶点为中心和以瞳孔为中心测量的同一指标之间采用Kendall W值进行一致性分析。结果术前圆环模式下:角膜顶点组4 mm ASF、4 mm TNP、6 mm TNP、4 mm TCRP均较瞳孔中心组高,6 mm TCRP较瞳孔中心组低(均为P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术前区域模式下:角膜顶点组4 mm ASF、2 mm TNP、4 mm TNP、6 mm TNP、4 mm TCRP均较瞳孔中心组高(均为P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术后3个月仅圆环模式下角膜顶点组2 mm ASF较瞳孔中心组高,差异有统计学意义(P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术前及术后3个月不同模式下两组患者各指标Kendall W值位于0.978~0.999间,各项结果一致性较好(均为P<0.05)。结论超声乳化白内障吸除术前后患者角膜不同区域和不同中心范围内部分角膜参数有所变化,总体比较以角膜顶点为中心和以瞳孔为中心测量的角膜参数一致性较好。展开更多
Vacuum well point is a new but faint soft ground treatment method. This work focuses on the consolidation behavior of a reconstituted soft clayey specimen under vacuum well point combined with surcharge loading. The l...Vacuum well point is a new but faint soft ground treatment method. This work focuses on the consolidation behavior of a reconstituted soft clayey specimen under vacuum well point combined with surcharge loading. The laboratory test was conducted through a vacuum-surcharge consolidation apparatus, and the vacuum loading scheme was adopted for vacuum pressure application to investigate the vacuum effect on soil consolidation. In the testing process, some key parameters such as vacuum pressure, pore water pressure and settlement deformation were timely recorded. Furthermore, the water content, void ratio and permeability coefficient of samples collected after loading were measured to reflect the consolidation characteristics. By comparing with the membrane system and membraneless system, something different was found for the vacuum well point method. The results indicate that the consolidation behavior of an axisymmetric single vacuum well point is almost identical to the behavior of vacuum preloading combined with prefabricated vertical drain(PVD), except for the distribution of the vacuum pressure along the well drain due to the structure of the vacuum well point. And the vacuum well point method may be useful for the improvement of soft clayey deposit in a certain depth.展开更多
文摘目的探讨超声乳化白内障吸除术前后不同测量中心患者角膜参数的差异和一致性。方法选取2020年10月至2021年5月在潍坊眼科医院行超声乳化白内障吸除术及Pentacam检查的白内障患者共148例(148眼)。根据Pentacam测量模式“以角膜顶点为中心”或“以瞳孔为中心”分为角膜顶点组和瞳孔中心组。术前及术后3个月,通过Pentacam测量手术前后以角膜顶点为中心和以瞳孔为中心2 mm、4 mm、6 mm圆环和区域模式下患者角膜前表面屈光力(ASF)、角膜真实净屈光力(TNP)和总角膜屈光力(TCRP);以角膜顶点为中心和以瞳孔为中心测量的同一指标之间采用Kendall W值进行一致性分析。结果术前圆环模式下:角膜顶点组4 mm ASF、4 mm TNP、6 mm TNP、4 mm TCRP均较瞳孔中心组高,6 mm TCRP较瞳孔中心组低(均为P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术前区域模式下:角膜顶点组4 mm ASF、2 mm TNP、4 mm TNP、6 mm TNP、4 mm TCRP均较瞳孔中心组高(均为P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术后3个月仅圆环模式下角膜顶点组2 mm ASF较瞳孔中心组高,差异有统计学意义(P<0.05);其余指标两组间差异均无统计学意义(均为P>0.05)。术前及术后3个月不同模式下两组患者各指标Kendall W值位于0.978~0.999间,各项结果一致性较好(均为P<0.05)。结论超声乳化白内障吸除术前后患者角膜不同区域和不同中心范围内部分角膜参数有所变化,总体比较以角膜顶点为中心和以瞳孔为中心测量的角膜参数一致性较好。
基金Projects(41202220,41472278)supported by the National Natural Science Foundation of ChinaProject(20120022120003)supported by the Research Fund for the Doctoral Program of Higher Education,ChinaProject(2652012065)supported by the Fundamental Research Funds for Central Universities,China
文摘Vacuum well point is a new but faint soft ground treatment method. This work focuses on the consolidation behavior of a reconstituted soft clayey specimen under vacuum well point combined with surcharge loading. The laboratory test was conducted through a vacuum-surcharge consolidation apparatus, and the vacuum loading scheme was adopted for vacuum pressure application to investigate the vacuum effect on soil consolidation. In the testing process, some key parameters such as vacuum pressure, pore water pressure and settlement deformation were timely recorded. Furthermore, the water content, void ratio and permeability coefficient of samples collected after loading were measured to reflect the consolidation characteristics. By comparing with the membrane system and membraneless system, something different was found for the vacuum well point method. The results indicate that the consolidation behavior of an axisymmetric single vacuum well point is almost identical to the behavior of vacuum preloading combined with prefabricated vertical drain(PVD), except for the distribution of the vacuum pressure along the well drain due to the structure of the vacuum well point. And the vacuum well point method may be useful for the improvement of soft clayey deposit in a certain depth.
