Flashes / Floaters

Flashes and or floaters are mainly harmless, however some indicate a serious problem with your eyesight. We can examine your eyes locally and thoroughly with the aid of a modern Optos retinal camera.

We have the only Optos camera in North East Essex. Eye drops are rarely needed, the flash from the camera is similar to a flash from a normal domestic camera. Depending on the results you may still need to have eye drops for further checks.

The alternative is to be examined at the Eye Hospital in Colchester, where eye drops will definitely be used.

The examination will probably covered by the NHS; please ask for details.

Likely causes

Flashes and Floaters in your eyesight are usually caused by the vitreous changing in shape. This is a normal aging process, however  this change in shape may cause traction on your retina, which in turn may cause the retina to tear.

If you have a retinal tear or hole, liquid may pass through the hole or tear and find its way behind your retina. In that case you would have a retinal detachment. Retinal detachments need urgent detection and repair. The sooner they are detected and repaired the less stress it will cause you. Small tears can be detected early, these can be treated by laser, definitely less stressful than eye surgery.

Nearsighted patients are more likely to suffer a retinal tear as their retina is more stretched / thinner. However, in most cases the retina does not tear and the vitreous just changes shape. 

Some flashes in your vision are caused by vascular problems and can be associated with migraines.

What is the vitreous?

The vitreous is a gel-like substance, which fills the cavity in the middle of the eye between the retina (“the photographic film of the eye”) and lens. The vitreous is important during the growth of the eye but in adult life it serves no useful purpose. During life the vitreous becomes more liquid-like with clumps of thickened gel in between pools of liquid. These appear to you as floaters – these are very common and most people have some.

What is a Posterior Vitreous Detachment?

In middle age (or earlier in short sighted people) the vitreous gel can become so liquid like that it collapses away from the back of the eye (this is called a ‘posterior vitreous detachment’ or ‘PVD’).

What are the symptoms of a Posterior Vitreous Detachment?

When a ‘PVD’ occurs, more floaters than normal (often larger than before) suddenly appear in the vision and flashing light effects can occur.

Is treatment required?

A ‘PVD’ is a very common condition. If the retina is not damaged, then no treatment is required. You may be aware of floaters in your vision but the vision should not get worse. With time you will probably find that the floaters become less noticeable and the flashes of light stop. Floaters can be very annoying but unfortunately there is no simple way to remove them.

Is a Posterior Vitreous Detachment linked to a Retinal Detachment?

A vitreous detachment is different from retinal detachment. However, occasionally a vitreous detachment can cause a retinal detachment by pulling tears in the retina as the vitreous gel pulls away from the retina. You will therefore need a careful examination of your eyes to assess whether any tears in the retina have occurred and if treatment is needed. Generally tears in the retina form when a posterior vitreous detachment first occurs. If there are no tears or holes in the retina when you are seen you should be fine.



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