论文部分内容阅读
随着准分子激光矫正屈光不正手术的发展,如何提高手术后的视觉质量,已经成为新的研究热点。其中角膜非球面性是影响术后视觉质量的一个重要因素,成为准分子屈光手术医师关注的焦点之一。大量研究表明,手术后角膜非球面状态发生明显的变化,由术前的长椭圆形(prolate)演变为术后的扁椭圆形(oblate);非球面改变的直接结果是使角膜的负球差和高阶像差增加。高阶像差的增加导致手术后的对比敏感度较手术前降低,进而影响视觉质量。本文就角膜前表面非球面性参数(Q值)及其相关与不相关因素予以综述。
With the development of excimer laser ametropia surgery, how to improve the visual quality after surgery has become a new research hotspot. Among them, corneal asphericity is one of the most important factors affecting postoperative visual quality, and has become one of the focuses of excimer refractive surgeons. A large number of studies have shown that the corneal aspheric state after surgery significant changes occurred from the preoperative long oval (prolate) evolved into the oblate oblate; the direct result of aspheric changes is to make the corneal negative spherical aberration And higher-order aberrations increase. The increase in higher-order aberrations results in lower contrast sensitivity after surgery than before surgery, which in turn affects visual quality. In this paper, the anterior corneal asphericity (Q value) and related and unrelated factors are reviewed.