• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Conference on ophthalmic technologies >How detrimental is eye movemdent during Photorefractive Keratectomy to the patient's post-operative vision?
【24h】

How detrimental is eye movemdent during Photorefractive Keratectomy to the patient's post-operative vision?

机译：屈光性角膜切除术对患者术后视力有何危害？

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study aimed to gauge the effect of the patient's eye movement during Photo Refractive Keratectomy (PRK) on post-operative vision. A computer simulation of both the PRk procedure and the visual outcome has been performed. The PRK simulation incorporated the pattern of movement of the laser beam to perform a given correction, the beam characteristics, an initial corneal profile, and an eye mvoement scenario; and generated the corrected corneal profile. The regrowth of the epithelium was simulated by selecting the smoothing filter which, when applied to a corrected cornea with no patient eye movemnet, produced similar ray tracing results to the original corneal model. Ray tracing several objects, such as letters of various contrast and ssizes was performed to assess the quality of the post-operative vision. Eye movement scenarios included no eye movement, constant decentration and normally distributed random eye movemnet of varying magnitudes. Random eye movemnet of even small amounts, such as 50 microns reduces the contrast sensitivity of the image. Constant decentration decentres the projected image on the retina, and in extreme cases can lead to astigmatism. Eye movements of the magnitude expected during laser refractive surgery have minimal effect on the final visual outcome.
机译：这项研究旨在评估患者在屈光性角膜切除术（PRK）期间眼睛运动对术后视力的影响。已经执行了PRk程序和视觉结果的计算机模拟。 PRK模拟结合了激光束的运动模式以执行给定的校正，光束特性，初始角膜轮廓和眼球运动场景;并生成校正后的角膜轮廓。通过选择平滑滤镜模拟上皮的再生长，该滤镜在没有患者眼动网的情况下应用于矫正的角膜时，会产生与原始角膜模型相似的光线追踪结果。光线追踪了多个对象，例如各种对比度和大小的字母，以评估术后视力的质量。眼球运动场景包括无眼球运动，恒定注意力集中和大小不等的正态分布随机眼球运动。即使很小的随机眼动图，例如50微米，也会降低图像的对比度灵敏度。持续偏心会使投影在视网膜上的图像偏心，在极端情况下会导致散光。激光屈光手术中预期的眼动幅度对最终的视觉效果影响很小。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号