Eye Floaters and Flashes: Causes and When to Seek Medical Attention

Author - The Eye Care Clinic

Have you ever noticed small dark spots, thread-like shapes or moving shadows in your vision? These are commonly called eye floaters. Some people also notice brief flashes of light, particularly when moving their eyes.

Floaters and flashes can occur due to changes inside the eye. While some are related to normal ageing, a sudden increase in floaters or flashes can sometimes indicate a retinal problem that needs urgent medical attention.

What Are Eye Floaters?

Floaters are small shapes that appear to move across your field of vision. They may look like:

  • Tiny dark dots.

  • Threads or cobweb-like shapes.

  • Transparent spots.

  • Small circles or irregular shadows.

They are usually caused by changes in the vitreous, a gel-like substance that fills the inside of the eye. As people age, the vitreous may become thinner and develop small clumps that cast shadows on the retina.

Why Do Flashes of Light Occur?

Flashes may appear as brief streaks, sparks or flickers of light. They can occur when the vitreous pulls on the retina.

One possible cause is posterior vitreous detachment, a common age-related change. However, traction on the retina can sometimes result in a retinal tear.

A retinal tear may allow fluid to pass underneath the retina, potentially leading to retinal detachment.

When Should You Seek Medical Attention?

Certain symptoms should not be ignored. Arrange an urgent eye examination if you notice:

  • A sudden increase in floaters.

  • New or repeated flashes of light.

  • A dark shadow or curtain-like effect across your vision.

  • Sudden blurred or reduced vision.

  • A sudden change in vision following an eye injury.

These symptoms do not always mean retinal detachment has occurred, but they require prompt assessment.

How Are Floaters and Flashes Evaluated?

An ophthalmologist may perform a dilated retinal examination to check the vitreous and retina.

Depending on the findings, additional investigations may be recommended.

Treatment depends on the underlying cause. Ordinary age-related floaters may only require observation. A retinal tear may need laser treatment or another procedure, while retinal detachment often requires surgery.

Can Eye Floaters Be Prevented?

Age-related vitreous changes cannot always be prevented. However, people with certain risk factors, such as high myopia, previous retinal problems or eye injuries, may need closer monitoring.

Avoid ignoring sudden changes in vision or assuming that new floaters are simply part of ageing.

Conclusion

Eye floaters and flashes are sometimes harmless, but sudden changes can indicate a retinal condition. Recognising warning signs and seeking timely evaluation can help protect vision.

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