he space between the crystalline lens and the retina is filled with a clear, gel-like substance called vitreous.  In a newborn, the vitreous has an egg-white consistency and is firmly attached to the retina.  As we get older, the vitreous thins and may separate from the back of the eye.  This is called a posterior vitreous detachment (PVD).  When the vitreous pulls free, it is often accompanied by light flashes or floaters. 

Are there other causes of floaters?

PVD is the most common cause floaters and light flashes.  It is usually harmless and no treatment is necessary.  However, floaters may also be caused by retinal tears, retinal detachment, infection, inflammation or hemorrhage. 

Is there any treatment for floaters?

Surgical removal of the vitreous (vitrectomy) may be considered only if the vision is significantly affected. This treatment is rarely needed since floaters typically become less bothersome over a period of weeks to months.

What causes light flashes?

Typically light flashes are a result of the vitreous gel pulling on the retina. This may occur with PVD, an injury or a blow to the eye.  (Have you ever seen stars after bumping your head?)  Occasionally, flashes of light are caused by neurologic problems such as a migraine headache. In this case, the flashes of light are seen in both eyes and usually lasts several minutes.

When should you see your doctor?

If you notice a sudden shower of floaters, new light flashes, a veil or curtain obstructing your vision, or any other decrease in your vision, notify your physician immediately.  Your doctor will dilate the pupil with drops and examine inside the eye. 

You can monitor your symptoms by covering one eye at a time and testing your vision.  While looking straight ahead, note any obstructions or change in the quality of your central and peripheral vision.  Note the duration and intensity of your symptoms, comparing the vision of both eyes.  Notify your doctor if you detect any significant changes.

St. Luke's Cataract & Laser Institute provides this on-line information for educational and communication purposes only and it should not be construed as personal medical advice.  Information published on this St. Luke's website is not intended to replace, supplant, or augment a consultation with an eyecare professional regarding the viewer/user's own medical care.  St. Luke's disclaims any and all liability for injury or other damages that could result from use of the information obtained from this site.