Our bodies need a certain amount of sunlight. The sun brings us a zest for life and has a positive impact on our bodies. But, like all things, with the rays of the sun too we need the right dose. Too much sun presents a risk to our skin and eyes.
Our eyes alert us when the visible rays are too bright through a feeling of glare. Our pupils narrow and we squint. Tinted lenses decrease the permeability of the visible rays and protect us from them.
In addition to the visible rays, the sunlight also contains UV light, which is invisible to humans. It radiates at a higher frequency and is therefore not perceived by the human eye. Good sunglasses, however, should also contain a UV filter. This is integrated into the material of the sunglasses and cannot be seen with the naked eye. A good indication that there is a UV filter is the CE symbol, but careful, the seal of approval on the inside of the side pieces are not issued by a central body and can therefore easily be forged. The greatest possible degree of safety is provided by buying sunglasses from a specialist shop which guarantees the quality.
23wfcThe longer the sun shines into an unprotected eye, the greater the damage caused by the rays.
The person affected will develop pain and watery, red eyes around 6 to 8 hours after contact with the sun. Since winter sports fans are often affected by this, sunburn in the front part of the eye, or cornea, is also known as snow blindness. Like sunburn on the skin, this will disappear in around two days with the right treatment.
Rays from the sun over many years can lead to a pterygium, or growth in the eye. In this condition, the conjunctiva (white tissue) grows slowly over the cornea (transparent layer in front of the iris). This initially harmless but often cosmetically disfiguring change can subsequently be treated through an operation.
It is worse if the lenses in our eyes are exposed to too much sun in the long term. This can lead to premature cataracts. Like in a window that hasn’t been cleaned, the visual acuity will decrease, and a grey veil will appear over the vision.
In extreme cases, UV rays come into contact with the retina. The macula can also be affected, leading to macular degeneration. This normally only occurs in older people, but if the retina and the macula have been exposes to too many UV rays premature deposits. The macula is responsible for the central vision, such as that required for reading and driving.
                                                                          Healthy vision                              Advanced macular degeneration
In addition to providing glare and UV protection, sunglasses should also sit correctly and comfortably and the frames should be correctly processed. Polarised sunglasses are recommended for water lovers and ski fans, as these prevent reflections, and those who play golf need sunglasses which increase the contrast of green surfaces. Brown and grey tinted sunglasses distort the perception of colour the least. In principle, the following applies: “seeing well and looking good with the right protection”.