Department of Ophthalmology, Hospital Oftalmológico Visão Laser, Santos, Brazil.
Department of Ophthalmology and Visual Sciences, Federal University of São Paulo (UNIFESP), São Paulo, Brazil.
Indian J Ophthalmol. 2024 Sep 1;72(9):1363-1368. doi: 10.4103/IJO.IJO_3182_23. Epub 2024 Aug 23.
This case series reports eight eyes with keratoconus treated with laser implantation of one or two segments of progressive thickness corneal intrastromal ring (PT-ICRS). In this case series, it was evident that the insertion of PT-ICRS induces more pronounced corneal flattening at the thickest point, causing a reduction in distortion (coma) and lower astigmatism, resulting in a remarkable improvement in vision. Compared to the implementation of traditional intrastromal rings, the PT-ICRS variant showed superior results despite the small sample size. However, the same degree of asymmetry enhancement was not observed in cases in which a 330° PT-ICRS was implanted, despite the improvement in visual results when replacing a 320° traditional ring with a 330° PT-ICRS. These conclusions are limited as this is a case series with few cases.
本病例系列报告了 8 只圆锥角膜眼接受了一个或两个渐进式角膜基质内环形切开术（PT-ICRS）段的激光植入治疗。在本病例系列中，显然 PT-ICRS 的插入在最厚点引起更明显的角膜变平，从而减少了变形（彗差）和较低的散光，导致视力显著改善。与传统的基质内环的实施相比，尽管样本量较小，但 PT-ICRS 变体显示出更好的结果。然而，在植入 330°PT-ICRS 的情况下，并未观察到相同程度的不对称增强，尽管当用 330°PT-ICRS 代替 320°传统环时，视觉结果得到了改善。这些结论是有限的，因为这是一个病例系列，案例较少。
