Vargas Veronica, Alió Jorge
1 VISSUM Instituto Oftalmologico de Alicante, Alicante, Spain.
2 Division of Ophthalmology, Universidad Miguel Hernández, Alicante, Spain.
Eur J Ophthalmol. 2019 Jan;29(1):NP1-NP5. doi: 10.1177/1120672118787436. Epub 2018 Jul 24.
: To describe a case of Posterior Keratoconus (keratoconus posticus); its clinical condition, corneal, refractive response to intracorneal ring implantation (MyoRing), anterior segment optical coherence tomography findings; and micro incisional cataract surgery outcome.
: Case report.
: The case was studied with high resolution anterior segment optical coherence tomography (OCT), epithelium OCT, corneal topography, and aberrometry. A MyoRing was implanted and after the development of cataract, microincisional cataract surgery was performed. A large hyperopic shift was observed following the ring implantation. Calculation of the intraocular lens showed poor predictability.
: Posterior keratoconus is a rare corneal congenital disorder characterized by a posterior corneal elevation. Surprisingly, on the total corneal aberrometry, the coma is within normal levels; in the anterior and posterior corneal aberrometry, all the low order and high order aberrations are outside of normal parameters. The epithelial thickness is normal on the contrary to anterior keratoconus. Micro incisional cataract surgery can be safely performed in these eyes, although a refractive surprise is expected due to errors in the intraocular lens calculation.
描述一例后圆锥角膜（圆锥角膜后凸）病例；其临床状况、角膜情况、对角膜内环植入术（MyoRing）的屈光反应、眼前节光学相干断层扫描结果；以及微切口白内障手术的结果。
病例报告。
对该病例进行了高分辨率眼前节光学相干断层扫描（OCT）、上皮OCT、角膜地形图和像差测量研究。植入了一个MyoRing，在白内障形成后，进行了微切口白内障手术。环植入后观察到明显的远视性移位。人工晶状体计算显示可预测性较差。
后圆锥角膜是一种罕见的角膜先天性疾病，其特征为角膜后表面隆起。令人惊讶的是，在全角膜像差测量中，彗差处于正常水平；在前角膜和后角膜像差测量中，所有低阶和高阶像差均超出正常参数范围。与前圆锥角膜相反，上皮厚度正常。尽管由于人工晶状体计算误差预计会出现屈光意外，但在这些眼中可以安全地进行微切口白内障手术。
