Department of Cornea and Refractive Surgery, Narayana Nethralaya Superspeciality Eye Hospital and Postgraduate Institute, Bangalore, Karnataka, India.
Indian J Ophthalmol. 2013 Aug;61(8):445-50. doi: 10.4103/0301-4738.116067.
Keratoconus is a progressive ectatic disorder of the cornea which often presents with fluctuating refraction and high irregular astigmatism. Correcting the vision of these patients is often a challenge because glasses are unable to correct the irregular astigmatism and regular contact lenses may not fit them very well. Topography-guided custom ablation treatment (T-CAT) is a procedure of limited ablation of the cornea using excimer laser with the aim of regularizing the cornea, improving the quality of vision and possibly contact lens fit. The aim of the procedure is not to give a complete refractive correction. It has been tried with a lot of success by various groups of refractive surgeons around the world but a meticulous and methodical planning of the procedure is essential to ensure optimum results. In this paper, we attempt to elucidate the planning for a T-CAT procedure for various types of cones and asphericities.
圆锥角膜是一种进行性扩张性角膜疾病，常表现为屈光力不稳定和高度不规则散光。这些患者的视力矫正通常具有挑战性，因为眼镜无法矫正不规则散光，而普通软性隐形眼镜可能不太适合他们。基于角膜地形图引导的个性化切削治疗（T-CAT）是使用准分子激光进行有限度角膜切削的一种手术，目的是使角膜规则化，改善视力质量，并可能改善隐形眼镜的适配性。该手术的目的不是提供完全的屈光矫正。世界各地的许多屈光外科医生都成功地尝试了这种手术，但为了确保最佳效果，手术的规划必须细致和系统。在本文中，我们尝试阐明针对各种类型圆锥角膜和非球面性的 T-CAT 手术规划。
