Eye Clinic Orasis, Swiss Eye Research Foundation, 5734 Reinach AG, Switzerland.
Department of Radiation Oncology, Inselspital, Bern University Hospital, University of Bern, 3012 Bern, Switzerland.
Sensors (Basel). 2021 Feb 2;21(3):975. doi: 10.3390/s21030975.
It is known that pterygia above a certain size cause astigmatism and other aberrations of the human cornea and thus impair the quality of vision. Exclusive Sr-/Ytt-90 beta irradiation is a highly effective treatment for primary pterygia. The aim of this retrospective study is to determine the extent to which higher order corneal aberrations are affected by this treatment.
Evaluation of corneal topographies and wavefront aberration data of 20 primary pterygia patients generated before and at different points in time in the first year after irradiation. Additionally, the size of the pterygium was measured.
The study showed a significant increase in coma and triple leaf aberrations in pterygia with a horizontal length of 2 mm and more. It was also found that a pterygium size greater than 2 mm significantly induces astigmatism. Both phenomena reduce visual quality. In none of the patients could a pterygium recurrence be detected after irradiation.
If the pterygium size is less than 2 mm, early exclusive Sr/Ytt-90 beta irradiation can be recommended. If the size is more than 2 mm, a pterygium excision 6 months after beta irradiation can be discussed.
众所周知，超过一定大小的翼状胬肉会导致人眼角膜散光和其他像差，从而损害视力质量。单纯的 Sr-/Ytt-90β射线辐射是治疗原发性翼状胬肉的一种非常有效的方法。本回顾性研究旨在确定这种治疗方法对高阶角膜像差的影响程度。
评估了 20 名原发性翼状胬肉患者的角膜地形图和波前像差数据，这些数据是在照射前以及照射后第一年的不同时间点生成的。此外，还测量了翼状胬肉的大小。
研究表明，水平长度为 2 毫米及以上的翼状胬肉中彗差和三叶像差明显增加。还发现，翼状胬肉大小大于 2 毫米会显著导致散光。这两种现象都会降低视觉质量。在所有患者中，照射后均未发现翼状胬肉复发。
如果翼状胬肉的大小小于 2 毫米，可以推荐早期进行单纯 Sr/Ytt-90β射线辐射治疗。如果大小大于 2 毫米，可以考虑在β射线辐射后 6 个月进行翼状胬肉切除术。
