Schanzer M C, Mehta R S, Arnold T P, Zuckerbrod S L, Koch D D
Cullen Eye Institute, Baylor College of Medicine, Houston, TX 77030.
CLAO J. 1989 Jul-Sep;15(3):207-11.
Three patients developed irregular corneal astigmatism while wearing annular tinted soft contact lenses on a daily basis for 1.5 to 3 years. There was severe keratometer mire distortion, and photokeratoscopy revealed central and midperipheral corneal topographical irregularities in four of six eyes. In a masked protocol, scanning electron microscopy of four contact lenses revealed physical deformations in three lenses worn on affected eyes. We propose that latent stress vectors were created when the affected contact lenses were tinted. With patient usage, the stress vectors matured into physical deformations that induced irregular astigmatism. The astigmatism resolved upon discontinuing wear of these lenses, and the patients were able to wear other lenses with no recurrence of symptoms.
三名患者在每天佩戴环形染色软性隐形眼镜1.5至3年期间出现不规则角膜散光。角膜曲率计的视标严重变形，角膜地形图检查显示六只眼中有四只眼的中央和中周边角膜形态不规则。在一项盲法试验中，对四副隐形眼镜进行扫描电子显微镜检查发现，佩戴在患眼上的三副镜片存在物理变形。我们认为，受影响的隐形眼镜在染色时产生了潜在应力向量。随着患者的使用，应力向量发展为导致不规则散光的物理变形。停止佩戴这些镜片后散光消失，患者能够佩戴其他镜片且症状未复发。
