Glaucoma is a disease that damages the optic nerve, and it can occur at any age but is more common in older adults. Glaucoma is often called the "silent thief of sight" because it can develop with minimal symptoms until vision loss occurs. Many forms of glaucoma have no warning signs, and the effect is so gradual that you may not notice a change in vision until the condition is in its later stages. However, there are some early signs of glaucoma that you should be aware of, including:

• Eye pain or discomfort
• Headaches
• Nausea or vomiting
• Halos around lights
• Sudden onset of visual field loss

Its important to note that most people with open-angle glaucoma feel fine and do not notice a change in their vision at first because the initial loss of vision is of side or peripheral vision, and the visual acuity or sharpness of vision is maintained until late in the disease. By the time a patient is aware of vision loss, the disease is usually quite advanced. Therefore, its crucial to have regular eye exams that include measurements of your eye pressure, as early detection of glaucoma can help slow or prevent vision loss.