retothelium

例句：

1. 1. The doctor examined the patient's retina and found no signs of damage.
   医生检查了患者的视网膜，没有发现任何损伤迹象。
2. 2. She lost her sight in one eye due to a rare genetic disorder.
   她因一种罕见的遗传病而失去了一只眼睛的视力。
3. 3. Retinal degeneration is a common cause of blindness in old age.
   视网膜退化是老年人失明的常见原因。