Sunset vision, also known as the sunset sign, usually occurs in children and is a typical ocular manifestation of hydrocephalus. The main manifestation is a downward gaze of the eye, with the upper white eye exposed and the black eye, or pupil, partially obscured by the lower eyelid, just like the setting sun, which is imaginatively referred to as the sunset sign. The child also has symptoms such as a larger skull diameter and mental depression because of hydrocephalus. Hydrocephalus occurs when there is an obstruction to the circulation of hydrocephalus within the skull and the fluid accumulates in the ventricles causing them to enlarge, which in turn leaks into the white matter of the brain and affects brain function. When the dilated third ventricle damages the midbrain structures, it can lead to impaired vertical eye movements, which can manifest as the sunset sign. Once the sunset sign appears, the child should be brought to the neurosurgery department of the hospital to identify the cause of the hydrocephalus and to treat it promptly.