It is not normal for the eyes to change from one to two when looking at a distance, which is considered to be caused by astigmatism, diplopia and other conditions. 1. Astigmatism: this condition is also a common clinical refractive error eye disease, the main cause of genetic factors, as well as eye trauma, surgery and so on. Patients often have blurred vision, visual fatigue and other symptoms, and visual fatigue often leads to double vision, eye swelling and other symptoms, which is manifested in the eyes to look at the distance one to two. 2. Diplopia: Diplopia is a typical condition that can lead to double vision, which is mainly due to the existence of underlying diseases such as strabismus, posterior scleritis, cataract, etc., or the existence of orbital fracture, lens subluxation and other conditions. In addition to the symptom of one eye becoming two eyes at a distance, some patients will also be accompanied by dizziness, eyelid edema and other symptoms. To summarize, it is not normal to see one eye in the distance and it is recommended that the patient consult a doctor as soon as possible to clarify the cause of the disease and follow the doctor’s instructions for reasonable treatment.