Floaters are transparent gray specks that some people may see in their line of sight. While they appear to be spots floating in front of us, they are in fact inside of the eyes. As one age, the gel-liked structure called the vitreous can begin to liquify over time. These spots usually occur when undissolved pieces of the vitreous start to float around in a liquified vitreous, casting a shadow on the retina as light passes through the eye. They shadows are what you see as floaters. They are more pronounced when you stare at a blank or uniform background, such as a computer screen or a clear blue sky while you are driving. They also tend to move with your eye making it seem like you cannot look at them directly.
Some people may observe photopsia, or flashes of light, in the absence of an actual light stimulus, or light scintillation. It can appear like an arc of lights in the periphery, a constant on and off flashing of a light bulb, or light. This occurs when the vitreous pulls on the retina.