Sometimes they can be caused by retinal detachment. They're usually caused by a harmless process called posterior vitreous detachment (PVD), where the gel inside your eyes changes. Lots of people, particularly older people, get floaters and flashes. You'll usually only need treatment if you have a problem that could affect your vision. Some migraineurs get what is known as 'aura' which are visual disturbances that can include wavy or zig zag lines, tunnel vision, blind spots, strange odors, or even sensations in the body including numbness or 'pins and needles' The aura occurs before migraine pain begins. sensation of looking through water or heat waves. Tension headaches: They are often described as a band-like pain or pressure around the head. blind spots, tunnel vision, or total loss of vision for a short period. vision, including seeing flashing lights or zigzag lines. a faint, foggy area surrounded by zigzag lines that can grow and break up over a period of 15 to 30 minutes. Vitamin A and zinc deficiency can cause problems with night vision. dots, stars, spots, squiggles, and flash bulb effects. Over time, diabetes can damage blood vessels and nerves in the eyes, leading to rainbow vision and night vision problems. If you have problems with floaters or flashes in your vision your eyes will be checked at an opticians to see if you need to be seen by an eye doctor (ophthalmologist) for more tests or treatment. Astigmatism: Blurry vision due to irregularly shaped cornea or lens. You can call 111 or get help from 111 online. These could be signs of a serious problem with the back of your eye, which could permanently affect your vision if it's not treated quickly. floaters start after eye surgery or an eye injury.you have a dark 'curtain' or shadow moving across your vision.the number of floaters or flashes suddenly increases.you suddenly get floaters or flashes in your vision.

you have floaters or flashes in your vision for the first time.

Anxiety and zigzag lines in eyes