角膜类脂环,过去亦称老年环,是在角膜缘内约1mm处的一圈灰白色混浊环。1956年巴尔格曼认为,此环是由于脂肪小滴沉着在固有层的细胞间隙和细胞内所致。萨缪尔斯等也指出,老年环内可见脂肪小滴聚集,唯一的异常就是脂滴沉积。近年来,随着角膜移植的广泛开展,对正常角膜及其冷藏状态下的超 Corneal alveolar ring, also known as the old ring in the past, is about 1mm in the corneal limb in a ring of white opacity ring. In 1956 Baggerman thought that this ring was due to the deposition of fat droplets in the lamina propria and intracellular layers of the lamina propria. Samuels et al also pointed out that the fat ring in the elderly ring gathered, the only exception is lipid droplets deposition. In recent years, with the extensive development of corneal transplantation, the normal cornea and its super-frozen state