New flashes or floaters: when it is urgent

Act on a sudden change

The vitreous is the clear gel inside the eye. Changes in it can cast moving shadows or pull on the retina, which can be perceived as floaters or flashes. The important distinction is between a familiar stable pattern and a sudden change, particularly with a curtain-like shadow or loss of vision. Only an appropriate eye examination can determine whether a tear or detachment is present; symptom descriptions cannot safely make that distinction at home.

A sudden shower of new floaters, flashes of light, or a curtain-like shadow across vision can be warning signs of retinal detachment. NEI advises going to an eye doctor or emergency department right away. Do not wait to see whether new glasses help.

An online check cannot rule it out

Retinal detachment involves the light-sensitive tissue at the back of the eye. A dilated examination can check for a tear or detachment. A clear photograph of the outside of the eye or a readable line of text does not replace that assessment.

Give a concise history

When contacting care, say when the change started, which eye is affected, whether there is a shadow or lost area of vision, and whether there was an injury. Mention previous eye surgery and high myopia. Keep the focus on arranging assessment without delay.

Separate routine questions from urgent ones

Questions about occasional longstanding floaters can be discussed at an eye examination, but a sudden increase changes the priority. Our editorial recommendation is to save your local urgent eye-care contact so you do not have to search for a service during a new episode.

A worked example

If someone notices a sudden shower of new spots and a dark area entering the side of vision, the next step is urgent eye care, not ordering a clearer lens or waiting for the next routine appointment. Record the onset time if you can, but do not delay care to complete a symptom diary. New urgent symptoms take priority over any self-check in this article.