Floaters are small semi-transparent or cloudy specks or what look like particles within the vitreous, the clear jelly-like substance that fills the insides of your eyes. They appear in different shapes and sizes, in lines or sometimes like cobwebs. They tend to move when your eyes move so it is hard to focus on them directly.
Floaters are caused by tiny pieces of protein or other matter trapped during the formation of the eye at birth. They can also be caused by the deterioration of the vitreous fluid, due to aging or they can be caused by eye diseases or injury to the eye.
Usually floaters are not harmful and rarely limit vision. But, spots can be indications of more serious problems and you should see your ophthalmologist or optometrist for a comprehensive eye exam if you notice any sudden changes in the floaters or if they increase in numbers.