What causes dizziness and darkening vision in both eyes?

　　In general, dizziness and vision darkening may be caused by overexertion, orthostatic hypotension, hypoglycemia, anemia, arrhythmia, and other conditions. Symptomatic management may involve general treatment, medication, and other approaches. If symptoms persist, it is recommended to seek timely medical attention and undergo appropriate treatment under a physician's guidance. A detailed explanation is as follows:

　　1. Overexertion

　　Prolonged work or study may lead to physical fatigue and cause neurological dysfunction, resulting in temporary visual impairment, such as vision darkening, accompanied by dizziness. Symptoms may also include fatigue, difficulty concentrating, and muscle soreness. It is recommended to take appropriate rest and relax muscles to alleviate symptoms, avoiding prolonged continuous eye strain or excessive fatigue.

　　2. Orthostatic Hypotension

　　Suddenly standing up after prolonged lying down or squatting may lead to hypotension due to rapid postural change, causing dizziness, headache, and vision darkening. It is recommended to rest adequately and avoid sudden standing after prolonged squatting or lying. When standing, movements should be slow to allow sufficient time for the body to adjust.

　　3. Hypoglycemia

　　Hypoglycemia is mainly caused by insufficient food intake or excessive blood sugar reduction. During hypoglycemia, the brain's energy supply decreases, affecting nervous system function and causing dizziness and visual disturbances. Symptoms may also include sweating, palpitations, and hunger. It is recommended to promptly consume sugary foods or beverages and use medications such as [medication names] as directed by a physician to relieve symptoms.

　　4. Anemia

　　Malnutrition, excessive blood loss, or impaired hematopoietic function may lead to anemia. Anemia reduces the blood's oxygen-carrying capacity, depriving brain tissue of sufficient oxygen and causing dizziness and visual disturbances. Symptoms may also include fatigue, pallor, and shortness of breath. It is recommended to take medications such as ferrous fumarate granules or ferrous sulfate tablets under medical supervision for treatment.

　　5. Arrhythmia

　　Abnormal cardiac electrophysiology or cardiovascular disease may trigger arrhythmia. During arrhythmia, the heart's pumping function may be impaired, reducing cardiac output or causing blood to pool in the heart. This can lead to insufficient cerebral blood supply, causing dizziness and vision darkening. Symptoms may also include palpitations, chest tightness, and shortness of breath. It is recommended to take medications such as metoprolol tartrate tablets or bisoprolol fumarate tablets as directed by a physician to alleviate symptoms.

　　It is advisable to regularly monitor blood pressure, blood glucose, and complete blood count in daily life to stay informed about personal health status.