Many people tend to see squiggly worm like lines and/or specks and spots that float across their eyes when they are looking at a blank document or backdrop. These lines and spots move across their eyes slowly, sometimes disappearing momentarily and reappearing after some minutes. Known as "eye floaters" these lines and spots that you see are not necessarily a cause for concern since it is quite common, in fact normal.
These eye floaters usually develop with age, but can also develop due to an injury or strain to the eye. They occur due to the formation of tiny clumps of cells that form inside the fluid inside the eye. What you see as specks and lines floating across the eye, are actually the shadows of these clumps, and not the clumps themselves moving. While these eye floaters are not serious and do not require treatment, do mention it to your ophthalmologist on your next appointment so that he can check for and rule out other possibilities of injuries or other complications related to the eye. If the floaters have occurred due to an injury then surgery might be recommended to correct the condition. If the number of floaters increases, coupled with vision loss, it could be due to retinal haemorrhage or diabetic retinopathy. Consult your doctor immediately if you notice any alarming changes in your vision - immediate treatment can prevent the condition from worsening and causing serious damage.
answered by M W