Clear squiggly lines are a type of eye floater, and their most common cause involves collagen, which are small flecks of protein, according to WebMD. The collagen comes from the back compartment of the eye, where it breaks off and floats into the line of vision. Most eye floaters are not dangerous.
Most eye floaters occur in people between the ages of 50 and 75, as WebMD reports. In addition to protein, it is possible but rare for eye floaters to appear due to eye disease or injury, eye tumors, and diabetic retinopathy. It is also rare but possible for floaters to appear due to retinal tears or detachment, bleeding in the eye and certain types of infection. People who have migraines may also see floaters.
Most people do not require medical treatment for eye floaters, as WebMD explains. If someone notices that the eye floaters worsen or sees flashes of light, it is important to see a doctor. Additionally, recent eye injuries and pain in the eyes are both causes to seek out medical assistance. It is possible to move the floaters out of the field of vision by moving the eyes, but if there are too many floaters, a doctor may suggest a vitrectomy, which is a surgical procedure that removes the floaters. However, there are some risks associated with the surgery, including retinal tears as well as detachment and cataracts.