The fact that the eyes can only see a little light indicates that the patient’s vision is poor, which may be caused by cataract, trauma or glaucoma. 1. Cataract: aging, heredity, and local nutritional disorders may lead to protein degeneration of the lens and cataracts. This disease will affect the patient’s vision, and when the condition is serious, the patient’s eyes can only see a little light. 2. Trauma: When the patient’s eyes are damaged by direct or indirect violence from outside, it may affect the patient’s vision and cause the patient to see only a little light. 3. Glaucoma: affected by systemic diseases or genetic factors, patients may develop glaucoma, the disease will affect the optic nerve, and in severe cases, patients can only see a little light. It is recommended that patients with significant vision loss should consult a doctor in a timely manner to assess their condition and follow the doctor’s instructions for treatment.