primary glaucoma的用法和样例：
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，即原发性青光眼，也可以由其他眼科或系统性疾病引起。 - 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.
网膜发育不良，角膜变性，白内障及续发性青光眼是常见使视力变坏的因素。
