A 53-year-old man who had been admitted to the hospital after a fall was noted to have an abnormal indentation of the lower eyelids. He had a history of corneal transplantation in both eyes. He had recently experienced progressive visual impairment, which had led to his fall. Ophthalmologic examination was notable for a deflection of the lower eyelids when he was looking down, owing to dome-shaped eyes, and decreased visual acuity. What is the most likely diagnosis?
一名53岁的男子在跌倒后被送入医院，他被注意到下眼睑有异常的凹陷。患者有双眼角膜移植史。他最近经历了进行性视力障碍，这导致了他的跌倒。值得注意的是，眼科检查发现患者在向下看时，由于圆顶状眼睛和视力下降，下眼睑偏斜。最可能的诊断是什么?
A. Astigmatism 散光
B. Corneal ulcer 角膜溃疡
C. Keratoconus 圆锥形角膜
D. Keratoglobus 球形角膜
E. Pellucid marginal degeneration 清晰的边缘退化
答案解析：
正确答案是圆锥角膜。圆锥角膜是一种非炎症性疾病，其特征是角膜变薄并呈圆锥状向外膨出。在严重病例中，眼睑向下偏斜，即芒森征。鉴于其疾病的晚期性质，该患者被转诊到眼科进行再次角膜移植。
正确答案：C
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