Optic nerve injury occurs when the optic nerve, which transmits visual information from the eye to the brain, is damaged. This injury can result from various causes, including trauma, tumors, or diseases like glaucoma and multiple sclerosis. Symptoms may include vision loss, blurred vision, or changes in color perception. Diagnosis typically involves a comprehensive eye examination and imaging tests, such as MRI or CT scans. Treatment options depend on the cause and severity of the injury and may include medications, surgery, or vision rehabilitation. Early intervention is crucial for improving outcomes and preserving vision.