Yes. The most common form, primary open-angle glaucoma, usually develops slowly and may cause no noticeable symptoms at first. Glaucoma is a group of conditions that damage the optic nerve—the bundle of nerve fibres carrying visual information from the retina at the back of the eye to the brain. Central vision used for reading and recognising faces may remain clear while small areas of peripheral vision are affected. Because these changes can be gradual, they may be difficult
