Which of the following statements is true about chronic open-angle glaucoma?

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Chronic open-angle glaucoma, a silent disease, is the most common form of glaucoma and is the most treatable cause of blindness. Patients can have open-angle glaucoma for a significant period of time before symptoms appear. By the time symptoms do appear, considerable damage usually has occurred. If chronic open-angle glaucoma goes untreated, the patient experiences characteristic loss of vision. The central vision may remain clear for a considerable period of time. However, if the condition progresses, the central vision is also lost, causing complete blindness. The best way to detect glaucoma is by having periodic routine ophthalmic examinations, which include IOP readings and optic nerve evaluations.

Which of the Following Statements Is True About Chronic Open-Angle