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What is light?

LIGHT IS ELECTROMAGNETIC RADIATION

The visible light is part of the electromagnetic radiation. The wavelength decides the properties of the radiation. Electromagnetic radiation always moves in the speed of light, which means that there is a bound relationship between frequency and wavelength. The shorter the wavelength, the higher frequency and thus higher energy. The part of the spectrum that we call visible light has a wavelength of about 400-750 nm. See the image below for a rough breakdown of what we call the different parts of the electromagnetic spectrum. Please note that there are different systems for dividing the wavelengths of the various colors, and this is one of the divisions that exist.

WHAT IMPACT DOES ELECTROMAGNETIC RADIATION HAVE ON OUR BODY?

Depending on the wavelength, the radiation affects us in different ways. Generally speaking, the shorter the wavelength, the more impact it has on us. Gamma rays can kill living cells at a high intensity and X-rays in high concentrations may cause cancer. Radio waves at the other end of the spectrum hardly affects us at all, they pass through our bodies without much impact.

WHAT HAPPENS IN THE EYE?

The eye is affected in the same way as the rest of the body. The eye also has to let in and detect the visible light. This makes it so that even the UV-light gets in and is allowed to affect the structures in the eye. UV-light speeds up the aging of the eye and may cause both cataract and macular degeneration.

When the visible light passes through the eye’s refracting surfaces the different wavelengths are broken up to different degrees, the blue part of the spectrum is affected the most and causes a distortion on the retina. The filter’s job is to block this light. Many who have tried our filters experience an increased comfort, sharpness and contrast. Especially patients with an impaired vision who have higher requirements that the information that reaches the retina should be as clear and sharp as possible.

Recent studies show that short-wave blue light can be harmful in the same way as the UV-light, which means that there is a protective effect of filtering out blue light.