There is no fixed recovery period for hemianopsia. If the primary disease can be treated in time at the onset, it is possible to recover from hemianopsia, but if the treatment is not timely, permanent damage will be caused, and hemianopsia cannot be recovered. Partial blindness is not caused by any abnormality of the eye itself, but due to the lesion of the nervous system, which affects the transmission of visual signals. It is usually seen in cerebral infarction, intracranial tumor and other diseases, and needs to be diagnosed through the examination of cranial magnetic resonance, cranial CT and so on. If the disease is detected in the early stage of development, and the primary disease is treated actively, such as unblocking the blocked blood vessels, removing tumors and other occupying lesions, etc., it is possible to release the inhibition of visual function, and thus recover from hemianopsia. The exact time of recovery from hemianopsia cannot be predicted, but if treatment is not timely, irreversible damage can occur and hemianopsia cannot be recovered.