limbal loop

例句：

1. 1. The patient'seye was examined to determine the cause ofthe limbal loop.
   患者的眼睛被检查以确定角膜环的原因。
2. 2. The doctor advisedthe patient to undergo surgery to correct thelimbal loop.
   医生建议患者接受手术来纠正角膜环。
3. 3. Thelimbal loop is acommon condition that can lead tovision problems.
   角膜环是一种常见的状况，可能导致视力问题。