keratoconus

例句：

1. 1. Thepatient's vision gradually deteriorateddue to keratoconus.
   由于角膜曲率异常，患者的视力逐渐恶化。
2. 2. The doctor advised the patient to undergosurgery to correct the keratoconus.
   医生建议患者接受手术来纠正角膜曲率异常。
3. 3. The patient was diagnosedwith keratoconus and requiredregular follow-up appointments.
   患者被诊断出患有角膜曲率异常，需要定期复诊。