Visual Pathways
Transient or persistent vision loss without an obvious ocular cause.
Sudden vision loss is a medical emergency. If you experience sudden loss of vision in one or both eyes, seek immediate medical attention at an emergency department. Do not wait for a WhatsApp message, an email reply or a routine appointment.
When vision loss is not explained by an obvious ocular cause on examination—such as cataract or a retinal disorder—neuro-ophthalmology assesses whether the cause lies in the optic nerve or the visual pathways connecting the eye to the occipital cortex within the brain.
It is important to distinguish transient vision loss, which resolves spontaneously within minutes or hours (such as amaurosis fugax), from persistent vision loss. Both require evaluation, but they have different implications and causes. Transient vision loss, in particular, may be a warning sign of a vascular problem that needs investigation.
When the evaluation suggests a neurological cause—for example a stroke or a lesion affecting the visual pathways—follow-up care is coordinated with neurology or other specialties as appropriate for each case.
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General references