15 years and older must be free of trachomatous trichiasis, the characteristic inward-turned lashes.

15 岁及以上的人必须没有沙眼倒睫，即睫毛内翻的特征。

And the country's health system must be capable of identifying and managing new cases of trachomatous trichiasis.

该国的卫生系统必须能够识别和管理新的沙眼倒睫病例。