Why Did I Suddenly Lose Vision in One Eye?

Sudden vision loss is never a symptom to watch casually. It can come from retina, optic nerve, blood vessel, neurologic, inflammatory, or pressure-related causes, and timing can determine whether vision can be saved.

For patients searching online, the most important point is that similar symptoms can have very different causes. Sudden vision loss, curtain, shadow, severe blur, or neurologic symptoms can be mild or serious depending on timing, severity, one-eye versus both-eyes involvement, and whether vision is changing. A medically trained eye examination is often the difference between treating the right problem and chasing symptoms with the wrong drops.

Sudden loss of vision in one eye may be caused by retinal detachment, retinal artery or vein occlusion, vitreous hemorrhage, optic neuritis, ischemic optic neuropathy, giant cell arteritis, acute glaucoma, or other urgent disease. A curtain or shadow is especially concerning for retinal detachment. Transient vision loss can also be vascular and should be taken seriously.

Any sudden vision loss, curtain, shadow, new severe floaters, flashes, eye pain with decreased vision, or neurologic symptoms requires urgent eye care or emergency evaluation.

Evaluation includes visual acuity, pupils, eye pressure, dilated retinal exam, OCT, retinal imaging, visual field testing, and sometimes urgent labs or neuroimaging depending on the findings.

Treatment depends entirely on cause. Retinal detachment may need surgery, inflammation may need medication, vascular causes may need emergency medical evaluation, and glaucoma requires pressure-lowering treatment.

Do not wait overnight or through a weekend with sudden vision loss. Do not drive yourself if vision is impaired or neurologic symptoms are present.