Clear air, white snow-covered mountains and rapid descents. Skiing is simply a must for many in winter. It's especially much fun when you can whizz down the slopes in wonderful sunshine or enjoy a cool drink on the sunny terrace of a mountain hut.
But particularly with sunshine and shiny new snow the danger for our eyes is very high. This is because snow reflects light and therefore also reflects a large proportion of ultraviolet (UV) rays. If our eyes are then not properly protected, the UV radiation can damage the cornea of the eye. Very strong radiation causes burn similar to sunburn of the cornea and conjunctiva - similar to those of normal skin - which in severe cases can destroy and detach the outermost layer of the cornea. In these cases, nerve endings are then exposed, which leads to severe pain, extreme sensitivity to light, tears, reddened eyes and foreign body sensation in the eye. Experts speak of snow blindness in such cases.
It is therefore important that we always wear sunglasses or ski goggles with UV protection, which block dangerous UV radiation. However, there are considerable differences in quality, as not all sunglasses block UV radiation equally well.
UV/Vis spectroscopy can be used to measure the transmission of spectacle lenses over the entire spectral range.
To perform this measurement, a spectrometer is used, which requires a broadband light source. FiberLight® Xe from Heraeus offers a broad continuous UV-Vis spectrum with very good flash to flash stability due to carefully selected electrode materials. This makes it, in addition to its long lifetime, the ideal light source for spectrometers.
The transmission spectra resulting from the measurement then provide information about the UV range in which the light is absorbed. With an absorption in the UV range from 200 to 400nm, the glasses then offer complete protection against UV radiation and the skiing day can be enjoyed without any worries.
Click here to learn more about analytical lamps like
You are also welcome to
if you would like more information.