Open-angle glaucoma causes gradual vision loss that begins with peripheral vision or the edges of a person's field of vision. Typically, open-angle glaucoma will affect both eyes. As a person loses their peripheral vision, what they can see begins to shrink towards the center. Experts refer to this as tunnel vision. Usually, tunnel vision only develops in the later stages of open-angle glaucoma because it takes a while for the vision loss to progress this far.
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