Laboratory of Vision Sciences and Applications, University of Granada, Spain.
J Refract Surg. 2012 Dec;28(12):901-6. doi: 10.3928/1081597X-20121106-01.
To analyze the theoretical effect that pupil size, optical zone, and initial myopic level have on the final retinal image after corneal refractive surgery.
A schematic myopic eye model corrected by the Munnerlyn formula was used to analyze the optical quality of the final retinal image. Root-mean-square radius spot and modulation transfer function were cal- culated by ray tracing to evaluate retinal image quality.
Pupil size had a negative effect on the retinal image only when it was greater than the diameter of the optical zone. In addition, the greater the initial myopic level, the more the pupil size affected image quality. Thus, a clear dependence exists between the initial myopic level and effect that the pupil size can have on the retinal image after laser refractive surgery.
Pupil size may be a risk factor for night vision disturbances, but only when it is larger than the theoretical optical zones utilized in this study. Its effect depends not only on the optical zone size, but also on the initial "myopic level. Therefore, this relationship should be taken into account during patient selection for refractive surgery
分析瞳孔大小、光区和初始近视程度对角膜屈光手术后最终视网膜像的理论影响。
使用 Munnerlyn 公式校正的近视眼模型进行分析，以分析最终视网膜图像的光学质量。通过光线追踪计算均方根半径斑点和调制传递函数，以评估视网膜图像质量。
只有当瞳孔直径大于光区直径时，瞳孔大小才会对视网膜图像产生负面影响。此外，初始近视程度越大，瞳孔大小对图像质量的影响越大。因此，初始近视程度与瞳孔大小对激光屈光手术后视网膜图像的影响之间存在明显的相关性。
瞳孔大小可能是夜视障碍的一个危险因素，但只有当瞳孔大小大于本研究中使用的理论光区时才会如此。其影响不仅取决于光区大小，还取决于初始“近视程度”。因此，在选择屈光手术患者时应考虑这种关系。
