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Why do moving "dots" appear when you look at the sky? The truth behind this biological phenomenon

2026-06-27 17:53:31Lifestyle SHKRUAR NGA REDAKSIA VOX
Why do moving "dots" appear when you look at the sky? The truth behind
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If you've ever seen small bright dots moving rapidly in erratic trajectories while looking at the clear blue sky, science assures you that you weren't seeing insects or dust.

But, it is a completely normal visual phenomenon, known as the Blue Field Entoptic Phenomenon, or Scheerer's phenomenon, according to "IFL Science".

This phenomenon was first discovered by German ophthalmologist Richard Scheerer in 1924 and has been studied in the field of ophthalmology for decades.

The phenomenon occurs when we look at a very bright and uniform surface, such as a cloudless sky, snow, or a brightly lit screen.

Under these conditions, some people see small white or bright spots that move quickly, often in zig-zag trajectories.

The explanation lies in the retina, the layer of the eye that captures light.

In its capillaries, red and white blood cells constantly circulate.

Red cells, thanks to hemoglobin, absorb more blue light, while white cells do not perform this function.

As a result, when a white blood cell passes through a capillary, it creates a slight contrast with the background and is perceived as a bright moving spot.

Scientists explain that our brain usually filters these signals and does not allow us to perceive them.

However, when we look at a blue and very bright background, like the sky on a sunny day, these cells become visible for a few moments.

Experts emphasize that the phenomenon is completely normal and is not a sign of any disease.

On the contrary, it shows that the retina and the blood circulation in it are functioning normally.

This phenomenon should not be confused with the so-called "floaters".

The latter are spots or threads that are created by changes in the vitreous body of the eye and can appear no matter where you look.

While Scheerer's phenomenon only appears when you look at very bright surfaces and is directly related to the movement of white blood cells in the capillaries of the retina.

Ophthalmologists even use this phenomenon in clinical practice.

There is a test called "Blue Field Entoptoscopy", which uses the perception of these dots to assess blood flow in the retina and the functioning of its microscopic vessels.

What makes the phenomenon even more interesting is the fact that it is one of the rare cases when a person can see, without any medical equipment, a biological process occurring inside their body.

For a few seconds, it is possible to perceive white blood cells as they move through the microscopic vessels of the retina – a detail that the brain usually hides from our awareness.


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