Collins Michael J, Buehren Tobias, Trevor Tasha, Statham Michael, Hansen Jacinta, Cavanagh Damien A
Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia.
Eye Contact Lens. 2006 Jul;32(4):168-73. doi: 10.1097/01.icl.0000189193.28870.81.
To investigate the effects of eyelid pressure on corneal topography in different angles of gaze and under different eye movement conditions.
Ten young subjects with healthy eyes were recruited for the study. Corneal topography of the right eye was measured with a videokeratoscope before and after four 15-minute visual tasks (downward gaze of 25 degrees or 45 degrees , both with no eye movements or 1 Hz eye movements). The four tasks were conducted on four separate mornings. RESULTS.: All subjects showed significant regions of topographic change after each of the four tasks. In general, eye movements were found to cause greater topographic changes than tasks without eye movements, and the larger angle of downward gaze led to greater changes in topography. The topographic changes were located close to the lid margin position during each task.
The pressure exerted by the eyelid is capable of altering corneal topography. These changes are enhanced when the eye looks downward and when the eye moves laterally.
研究眼睑压力在不同注视角度和不同眼球运动条件下对角膜地形图的影响。
招募10名右眼健康的年轻受试者参与本研究。在四项15分钟视觉任务（25度或45度向下注视，均为无眼球运动或1赫兹眼球运动）前后，使用视频角膜镜测量右眼的角膜地形图。这四项任务在四个不同的早晨进行。结果：所有受试者在四项任务中的每一项之后均显示出明显的地形图变化区域。总体而言，发现眼球运动比无眼球运动的任务引起的地形图变化更大，且向下注视角度越大，地形图变化越大。在每项任务期间，地形图变化位于靠近眼睑边缘的位置。
眼睑施加的压力能够改变角膜地形图。当眼睛向下看和向侧面移动时，这些变化会增强。
