What is sudden vision loss?
Sudden vision loss refers to a rapid reduction in sight that develops over minutes, hours, or a short period of time. It may affect one eye or both, and it may involve central vision, peripheral vision, or general visual clarity.
Even when the change is painless, it should be assessed promptly.
Possible retinal causes
Some retinal conditions can cause sudden visual symptoms, including retinal detachment, bleeding within the eye, or disorders affecting the macula.
Because the retina is essential for sight, these conditions require timely assessment. You can read more about retinal evaluation on the Retinal Care & Injections page.
Other possible causes
Sudden vision loss may also be associated with vascular events, inflammation, acute pressure-related problems, or other disorders affecting the optic nerve or internal structures of the eye.
This is why symptoms should not be attributed to a single cause without proper examination.
Retinal detachment and related symptoms
Retinal detachment may cause a sudden increase in floaters, flashes, or the sensation of a shadow moving across the field of vision. In some cases, the first symptom is simply a noticeable change in sight.
Because retinal detachment can threaten permanent vision, warning signs should be assessed promptly.
Do not wait for symptoms to settle
When vision changes suddenly, it is safer to have the eye examined than to wait and hope the symptoms improve on their own. Some causes may be time-sensitive, and timely assessment helps protect vision.
More information about urgent symptoms is also available on When to See an Eye Doctor.