Purpose. To investigate the peak latency of the orbital presaccadic spike potential (SP) with horizontal eye movement in normals.Methods. Orbital SP was recorded in 28 normal subjects from 8 electrodes around the eyes...Purpose. To investigate the peak latency of the orbital presaccadic spike potential (SP) with horizontal eye movement in normals.Methods. Orbital SP was recorded in 28 normal subjects from 8 electrodes around the eyes with Pz as the reference while performing 5°, 10°, 20°, 30° and 40°horizontal saccades to visual targets. SP peak latency was measured from SP onset to SP peak on averaged data aligned on SP peak.Results. Significant main effects on SP peak latency are found for saccade size (<0. 01), saccade direction (P<0. 01) and electrode site (P<0. 05). No significant main effect on SP peak latency is found for eye (P>0. 05). SP peak latency increases with increasing saccade size from 5°to 40°. SP peak latency is longer with saccades back to center than away from center, and with abducting saccades than with adducting saccades. SP peak latency differs at the electrode sites with an order from shorter to longer as follows: inner canthus (IC); inferior orbit (IO): outer canthus (OC); superior orbit (SO).Conclusicos. The effects on the peak latency of orbital SP can be explained by the saccade dynamic property, volume conduction as well as physiologic and anatomic factors of the eyes and orbits. The peak latency of orbital SP can be used to reflect the temporal characteristics of ocular motor units controlling saccadic eye movement.展开更多
目的:分析18-40岁成年人屈光度与眼球生物光学参数之间的相关性,并评估眼球各生物光学参数对近视发生、发展的影响,为近视防治工作提供科学依据。方法选取18-40岁成年人376只眼,其中正视眼180只,-8.00 D及以内的近视眼196只,用...目的:分析18-40岁成年人屈光度与眼球生物光学参数之间的相关性,并评估眼球各生物光学参数对近视发生、发展的影响,为近视防治工作提供科学依据。方法选取18-40岁成年人376只眼,其中正视眼180只,-8.00 D及以内的近视眼196只,用综合验光仪检测屈光度,光学相干生物测量仪( IOL-master)测量眼轴长度、角膜曲率半径、前房深度,眼科A超测量晶状体厚度及玻璃体深度。结果⑴正视眼组与近视眼组角膜水平曲率半径、角膜垂直曲率半径、眼轴长度、晶状体厚度、前房深度、玻璃体腔深度之间差异有统计学意义( P <0.01)。⑵屈光度数与眼轴长度及玻璃体腔深度呈高度负相关( r =-0.90,-0.88, P <0.01);屈光度与水平角膜曲率半径、垂直曲率半径呈高度正相关( r =0.81,0.84, P <0.01);而屈光度与晶状体厚度、前房深度低度相关( r =-0.11,0.12, P <0.01);眼轴长度和玻璃体腔深度之间呈高度正相关( r =0.95, P <0.01);水平角膜曲率和垂直角膜曲率之间呈高度正相关( r =0.91, P <0.01);眼轴长度与水平角膜曲率和垂直角膜曲率之间呈正相关( r =0.78,0.81, P <0.01)。结论屈光状态的两重要影响因素角膜曲率和眼轴长度具有显著正相关关系,寻求促进角膜曲率改变和眼轴增长的共同协同因子及找出控制角膜球形化的反馈机制有利于进一步探索控制近视发生、发展的方法。展开更多
文摘Purpose. To investigate the peak latency of the orbital presaccadic spike potential (SP) with horizontal eye movement in normals.Methods. Orbital SP was recorded in 28 normal subjects from 8 electrodes around the eyes with Pz as the reference while performing 5°, 10°, 20°, 30° and 40°horizontal saccades to visual targets. SP peak latency was measured from SP onset to SP peak on averaged data aligned on SP peak.Results. Significant main effects on SP peak latency are found for saccade size (<0. 01), saccade direction (P<0. 01) and electrode site (P<0. 05). No significant main effect on SP peak latency is found for eye (P>0. 05). SP peak latency increases with increasing saccade size from 5°to 40°. SP peak latency is longer with saccades back to center than away from center, and with abducting saccades than with adducting saccades. SP peak latency differs at the electrode sites with an order from shorter to longer as follows: inner canthus (IC); inferior orbit (IO): outer canthus (OC); superior orbit (SO).Conclusicos. The effects on the peak latency of orbital SP can be explained by the saccade dynamic property, volume conduction as well as physiologic and anatomic factors of the eyes and orbits. The peak latency of orbital SP can be used to reflect the temporal characteristics of ocular motor units controlling saccadic eye movement.
文摘目的:分析18-40岁成年人屈光度与眼球生物光学参数之间的相关性,并评估眼球各生物光学参数对近视发生、发展的影响,为近视防治工作提供科学依据。方法选取18-40岁成年人376只眼,其中正视眼180只,-8.00 D及以内的近视眼196只,用综合验光仪检测屈光度,光学相干生物测量仪( IOL-master)测量眼轴长度、角膜曲率半径、前房深度,眼科A超测量晶状体厚度及玻璃体深度。结果⑴正视眼组与近视眼组角膜水平曲率半径、角膜垂直曲率半径、眼轴长度、晶状体厚度、前房深度、玻璃体腔深度之间差异有统计学意义( P <0.01)。⑵屈光度数与眼轴长度及玻璃体腔深度呈高度负相关( r =-0.90,-0.88, P <0.01);屈光度与水平角膜曲率半径、垂直曲率半径呈高度正相关( r =0.81,0.84, P <0.01);而屈光度与晶状体厚度、前房深度低度相关( r =-0.11,0.12, P <0.01);眼轴长度和玻璃体腔深度之间呈高度正相关( r =0.95, P <0.01);水平角膜曲率和垂直角膜曲率之间呈高度正相关( r =0.91, P <0.01);眼轴长度与水平角膜曲率和垂直角膜曲率之间呈正相关( r =0.78,0.81, P <0.01)。结论屈光状态的两重要影响因素角膜曲率和眼轴长度具有显著正相关关系,寻求促进角膜曲率改变和眼轴增长的共同协同因子及找出控制角膜球形化的反馈机制有利于进一步探索控制近视发生、发展的方法。