Around half of the people who have glaucoma do not even know they have it, according to the Centers for Disease Control and Prevention (CDC).

Glaucoma is the second leading cause of blindness in the world. For women, the risk of glaucoma may even be related to estrogen levels.

Some women take hormone medications to help with menopausal symptoms. It's possible that these medications protect their eyesight as well.

Glaucoma is one of the leading causes of blindness. And women who use birth control may be at greater risk than those who don't.