Floaters may be normal. However, the sudden development of many new floaters or a significant change in your floaters can be a sign of another problem. Flashes of light may also accompany new floaters. Sudden and new symptoms should be evaluated by your eye doctor to determine if you have a retinal tear or detachment that might require immediate treatment to prevent vision loss. Some floaters come and go; others are visible for months or years. Most floaters will become less noticeable with time.