Moshirfar Majid, Hoggan Ryan N, Muthappan Valliammai
John A Moran Eye Center, Salt Lake City, Utah, USA.
University of Utah, School of Medicine, Salt Lake City, Utah, USA.
Oman J Ophthalmol. 2013 Sep;6(3):151-8. doi: 10.4103/0974-620X.122268.
Angle kappa is the difference between the pupillary and visual axis. This measurement is of paramount consideration in refractive surgery, as proper centration is required for optimal results. Angle kappa may contribute to MFIOL decentration and its resultant photic phenomena. Adjusting placement of MFIOLs for angle kappa is not supported by the literature but is likely to help reduce glare and haloes. Centering LASIK in angle kappa patients over the corneal light reflex is safe, efficacious, and recommended. Centering in-between the corneal reflex and the entrance pupil is also safe and efficacious. The literature regarding PRK in patients with an angle kappa is sparse but centering on the corneal reflex is assumed to be similar to centering LASIK on the corneal reflex. Thus, centration of MFIOLs, LASIK, and PRK should be focused on the corneal reflex for patients with a large angle kappa. More research is needed to guide surgeons' approach to angle kappa.
kappa角是瞳孔轴与视轴之间的夹角。该测量在屈光手术中至关重要，因为要获得最佳效果需要正确的中心定位。kappa角可能导致有晶体眼人工晶状体（MFIOL）偏心及其产生的光学现象。文献虽未支持针对kappa角调整MFIOL的放置，但这可能有助于减少眩光和光晕。对于kappa角患者，将准分子激光原位角膜磨镶术（LASIK）中心对准角膜光反射是安全、有效的，且值得推荐。将中心对准角膜反射与入瞳之间也是安全有效的。关于kappa角患者的准分子激光角膜切削术（PRK）的文献较少，但假定将中心对准角膜反射与将LASIK中心对准角膜反射相似。因此，对于kappa角较大的患者，MFIOL、LASIK和PRK的中心定位应聚焦于角膜反射。需要更多研究来指导外科医生处理kappa角的方法。
