Seeing moving dots when staring at a clear sky is normal. The white blood cell movement is a normal function of the eye, though not everyone notices the moving dots in their vision. Moving dots caused by the blue field entoptic phenomenon are all the same size and shape. If the eye stops moving, the spots keep whizzing around. In contrast, floaters, which are clumps in your vitreous, the gel-like fluid in your eye, differ in size and brightness.
If the eye stops moving, the floaters settle down. If the eye moves, the floaters follow more slowly. Flashes look like lightning streaks or stars, can last for 10 to 20 minutes and may come and go for several weeks or months.
If you notice a change in your vision or have a sudden onset of flashes or floaters, call an ophthalmologist right away. New or increased flashes or floaters can be a sign of a retinal detachment.
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Dr Chua Wei Han explains how laser-assisted cataract surgery offers consistent, safe and better results for cataract surgery. Further advancements in LASIK makes it possible for patients to regain perfect vision with greater precision and safety. Follow us Orchard Novena. Seeing Specks or Flashes of Light? If a floater troubles you, try looking up and down, and from side to side, to swish the vitreous humour and move the floater out of the way.
However, this does not always work. While some people find floaters troublesome, they are typically harmless and surgery is not needed. Eye floaters tend to increase with age due to changes that occur in the retina.
The retina is a thin film that lines the inside of the eye. It is made up of light-sensitive cells known as rods and cones. Rods and cones detect shape, colour and pattern, and pass the information to nerve fibres. Nerve fibres collect in a bundle at the back of the retina, forming the optic nerve. Visual information is relayed from the retina to the brain via this optic nerve. The vitreous humour pulls slightly away from the retina and degenerates with advancing years.
This separation of vitreous humour from the retina can cause small shreds of jelly to break off and form more floaters. At first, this can be irritating. In some people, the age-related detachment of the vitreous humour from the surface of the retina may cause tears.
Tiny droplets of blood may appear as a fresh crop of floaters. Short-sighted people and those who have undergone surgery for cataracts are at increased risk of tears to the retina. Untreated retinal tears can lead to retinal detachment. In this condition, the retina comes away from the back of the eyeball. This can be caused by events including:. Floaters are usually harmless. Seek immediate medical attention if you experience a sudden increase in floaters particularly if they occur as flashing lights auras , or a new big floater.
This is especially important if you are short-sighted. Eye care professionals use specialised equipment to examine the vitreous humour and the retina to determine whether there has been any tearing or detachment of the retina.
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