Transmission of UV - radiation is reduced by the glasses used in the FaderLux; furthermore, it has an integrated high quality multicoated UV filter which offers extra eye protection when viewing cloud intervals.
But please note that extended exposure to the sun can cause irreparable eye damage.
Transmission when turned to 7 Stops:
UV 365 2 %
UV 375 0 %
UV 395 0 %
UV 405 1 %
The test results reveal that protection in the FaderLux Viewing Glass covers the UV range beyond 400 nm and amounts to 99% in the densest position.
(FYI: European standard for extreme protection = category 4 in sunglasses is 92 – 97%)
Even the most transparent position – which is not required for cloud observation – still provides 86% UV-protection.
Information from the German Federal Office for Radiation Protection:
Ultra Violet radiation, covering wavelengths between 100 Nanometer (nm) and 400 nm, has the highest energy level of all optical radiation. According to its physical and biological characteristics, it is further divided into
UV-C: The extremely energetic UV-C-radiation is entirely screened out by the atmosphere, so no natural UV-C-radiation reaches the surface of the earth.
UV-B: Highly energetic UV-B-radiation is also largely screened out by the atmosphere, depending on the thickness of the ozone layer. But not entirely: Up to 10% of UV-B-radiation reach the surface. The levels may increase on account of the ozone hole phenomenon.
UV-A: Most of the longer-wavelength UV-A-radiation reaches the surface unobstructed.
UV-radiation is absorbed by the eye cells and causes various alterations.
Depending on its wavelength, it penetrates different regions in the eye: UV-A-radiation reaches further than the shorter-wavelength UV-B-radiation.
Acute effects from UV exposure are inflammation of the cornea, conjunctivitis and photochemical damage of the retina. Cataracts are a chronical effect.
The lense of the eye is affected the most as it absorbs the major part of UV-radiation penetrating the eye.
A small part of UV-A-radiation advances to the retina and is therefore largely associated with retinal alterations and macular degeneration (macula = part of the retina where visual perception is most acute).