Nystagmus is a condition characterized by involuntary, repetitive eye movements. These movements can be horizontal, vertical, or rotary, and they may affect one or both eyes. Nystagmus can occur due to various factors, including neurological disorders, inner ear problems, or as a side effect of certain medications. The condition can impact vision, making it difficult to focus on objects. It may also cause issues with balance and coordination. Diagnosis typically involves a comprehensive eye examination and assessment of the patient's medical history to determine the underlying cause and appropriate treatment options.