primary glaucoma的用法和樣例：
例句
- Glaucoma may occur congenitally, as a primary disease, or secondary to other ocular or systemic conditions.
青光眼可以是先天性的，即原發性青光眼，也可以由其他眼科或系統性疾病引起。 - Because one patient only suffers from iris coloboma instead of aniridia, we would like to propose that the primary embryological defect is due to aberrant development of mesoderm.
網膜發育不良，角膜變性，白內障及續發性青光眼是常見使視力變壞的因素。
