Why do 4K screens tire my eyes

Protect your eyes on the PC: You should follow these tips

Do you also suffer from office eye syndrome? It occurs when your eyes stare directly into a bright source of light for an extended period of time. Sometimes two hours are enough. Your eyes will then dry out. Typical symptoms of office eye syndrome are dry, itchy or burning eyes, blurred vision, tired eyes and increased sensitivity to light. And because sooner or later it becomes harder for the eyes to focus, there is also back and neck pain because one tenses more and more towards the screen.

In normal vision, the eye wanders freely and relaxed. It doesn't focus on a small area all the time. Computer work, on the other hand, overwhelms the eyes, the blinking of the eye is reduced, the tear film is no longer renewed often enough. If the flow of tears is reduced, the cornea roughened in extreme cases, which can lead to visual disturbances.

By blinking regularly, the tear fluid is distributed evenly over the eye. It contains not only water, but also many minerals for the cornea and thus counteracts dehydration.

Eyes prefer to see red rather than blue

But colors can also be easy on the eyes or overload them. The light reflected by an object falls through the pupil onto the retina and hits the color receptors, the so-called cones. These cones react when light of a certain wavelength falls on them.

There are three types: The S-stud type absorbs in the blue range up to a maximum of 420 nm, the M type in the green spectral range up to 534 nm and the L type in the yellow and red range up to 564 nm. Important to know: The red cone recognizes red particularly well, but is most sensitive in the range of yellow light.

The cones in the retina are more or less excited according to the color components contained in the light, and a chemical reaction creates an electrical impulse that is first processed in the retina and then passed on to the brain.

For example, if an object is yellow, the incident light in the eye excites red-sensitive cones and green-sensitive cones, since both are also responsible for the color yellow. If you look at the color orange, cones sensitive to red are more excited and cones sensitive to green are less strongly aroused.

At the point of sharpest vision there are only red and green cones. The blue cones are only present in the outer area of ​​the retina. Since the light that passes through the pupil is refracted to different degrees due to the wavelengths, the eye can only focus really well on one color.

Combinations of colors, the wavelengths of which are very different, are therefore perceived as unpleasant: for example blue and red. And that means stress for the eyes.

Continue reading: On the following page we explain how to set up your PC workstation in a way that is easy on the eyes.

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