Visual field loss means that part or all of the area you see while looking straight ahead is reduced or missing. This page gives general information about typical signs, possible causes, which specialists may be involved, common tests used in evaluation, and when to seek urgent care.
Loss can affect peripheral (side) vision or central vision and may be patchy, a complete missing area, or a partial half‑field loss (hemianopia). People may also notice blurring, double vision, flashes, sensitivity to light, or eye/ head pain. Onset can be sudden or gradual depending on the cause.
Causes range from retinal conditions (retinal tear, advanced glaucoma) and optic nerve problems (optic neuritis, optic atrophy) to brain‑level issues (stroke, brain tumor, head injury), vascular or inflammatory diseases. Ophthalmology (eye specialists) typically provide the initial assessment; neurology is involved when a brain cause is suspected. Primary care coordinates referrals and other specialties (infectious disease, neuro‑ophthalmology) may be consulted based on findings.
Evaluation starts with an eye exam including visual acuity and visual field testing (perimetry). Fundus examination and optical coherence tomography (OCT) can assess the retina and optic nerve. If a neurological cause is suspected, brain imaging such as MRI or CT may be ordered. Together, these tests help localize the problem and guide further care.
Seek immediate medical attention if vision loss is sudden, severe in one eye, or accompanied by neurological signs such as weakness, speech changes, or altered consciousness. For safety, avoid driving and using hazardous machinery until evaluated; ask for help with stairs or other risky situations. Low‑vision services and occupational rehabilitation can help adapt daily activities when vision is permanently reduced.
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