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Researchers have long understood the basics of the most common form of glaucoma, called open-angle glaucoma.

The study focused on the most common form, known as open-angle glaucoma, which starts with gradual loss of peripheral vision.

Since there are often no symptoms, especially in the early stages, a comprehensive eye exam may help to detect primary open-angle glaucoma.

"Medication to lower raised eye pressure has been used for decades as the main treatment for open-angle glaucoma to delay progressive vision loss," Garway-Heath said in a journal news release.

The researchers found that, overall, nearsighted people were about 90 percent more likely to also develop open-angle glaucoma.