Open-Angle Glaucoma

This is the most common form of glaucoma, affecting about 3 million American and accounting for at least 90 percent of all glaucoma cases. “Open-angle” means that the angle where the iris meets the cornea is as wide and open as it should be. Open-angle glaucoma is also called primary or chronic glaucoma. This type of glaucoma happens when the eye’s drainage canals become clogged over time.

The inner eye pressure (also called the intraocular pressure or IOP) rises because the right amount of fluid cannot drain out of the eye.

Are there symptoms?

There are no early warning signs of open-angle glaucoma. It develops slowly and sometimes without noticeable sight loss for many years. Most people who have open-angle glaucoma feel fine and do not notice a change in their vision. That is why regular eye exams are so important.


With early detection, open-angle glaucoma usually responds well to medication. However, it will be very important that you carefully follow your medication regimen to continually preserve a healthy eye pressure and prevent vision loss.

*Information courtesy of Glaucoma Research Foundation

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