Blurry spots or specks in your vision that move may be floaters — debris in the eye’s vitreous gel. They don’t block vision and are more easily seen in bright light. Floaters are common and usually harmless. But if they appear or increase suddenly, or are accompanied by light flashes, you should see a doctor. Vision abnormalities that tend to be more serious include persistent white or black spots and a sudden shadow or loss of peripheral vision. These require immediate evaluation.