Sunprotection with a diopter
You can fit tinted or photochrome lenses with any diopter into an appropriate frame to protect your eyes from the blinding sun. If you want to go to the beach, feel the smell of the sea, have a rest, escape from problems or find a new image, no doubt, you need sunprotective glasses with your diopter.
PROTECTION
Hard shortwave radiation is stopped by the atmosphere and mostly doesn’t reach the Earth’s surface. Most work materials of the lenses filtrate hard ultraviolet perfectly. But this function is important only high in the mountains or in the Anterctic. Radiation can be undoubtedly dangerous in the processes of metal welding and direct observation of the Sun. In such cases you need special filters, not sunprotective glasses.
This spectrum provides you with suntan and destroys bacteria. Lenses must protect your eyes from this very spectrum.
Even white and coated lenses weaken the impact of ultraviolet A considerably. Nontransparent work materials, such as wood or metal, provide 100% protection. “100%” label on the lens in reality means weakening of UV radiation according to the EU requirements. But how can you check it on?Current optical devices and testers for checking lenses’ protection level use available LED transmitters with the wavelength of 375-420 hm, i.e. measurements are taken on the line between visible and ultraviolet spectra. As a result, 90% protection means both EU and all-Union State Standard multiple overmatch. No manufacturer wants to hazard reputation. So, even affordable mass brands provide eye protection. During our years of work experience we have come across low protection level lenses only several times. They were always mineral lenses (glass), fake popular brands. Color rendering, working lifespan, level of darkening, optical quality and functionality are really more important. Negative effect of ultraviolet accumulates. That is why, the longer you wear glasses the better.
Blue spectrum is densely purple in reality. This wavelength is worst refracted by ocular media. It gives rise to eyesight strain. Long-continued use influences the decrease of the eyesight quality and quickening of macular dystrophy. But full removal of the blue spectrum leads to failures in color rendering. So, it is important to choose the best suitable for you type of filter which has suitable for your way of life and peculiarities of work characteristics.
What type of frame can be fitted with diopters?
Technically, it can be any of them. But a lens with a diopter has different width and shape for different diopters. Consequently, the size of the area light and the curvature of the frame are important. Very big glasses with a diopter can be too heavy and massy. High level of the curvature of the frame leads to visual discomfort. Bright design elements can be an obstacle to fitting the lenses: the inside rim can be too thin, exclusive lens fastening can be unreliable. Every case should be examined separately according to the combination of the final result: price and durability. It goes without saying that you need both an adviser and a technician who are experienced enough, who can choose the size, the curvature and a matching color of the filter. The outcome will be admirable.
Style
Holiday, beach, sunlight, new acquaintances… City, park, cafe, old friends… We will choose our lifestyle, and technical matters are up to an optician. Sunprotective glasses are a bright accessory which emphasizes or cardinally changes your image. Do classical or challenging, warm or cold tones match your hair and skin color? Will your glasses match your handbag or swimming costume? Will it match your coat or blazer? Choose your exclusive image.Don’t forget about translucent versions of lens tinting. You keep visual contact for private conversation but you are protected and your eyes look bright in any position.
WHAT TYPE OF FILTER CAN BE FITTED
The optimum alternatyive is CR-39 used for tinting. It has the best optical quality, low price, simplicity of use and the widest spectrum of diopters. An experienced technician is able to tint these lenses into any color from standardly tinted sunglasses to the color created by you or seen in the picture. The possibility of the correction of the final result is quite important. Disadvantages: thickness at big diopters and sizes, though tinted lenses look thinner than transparent ones, and weakness at small diopters and screw fastening.
You need it if you admire your image with a massive frame and your diopter isn’t small.There are three versions:- Tinting at the place of production and further coating. In this case you have to choose from a limited range of standard colors. It is a good choice for classical sunprotection but the price is considerable.- Special order of a high-index lens without coatings by necessity. It isn’t a cheap version. The range of colors is also limited. Complicated half-tones are not guaranteed. Though correction is possible. However, the functionality of this version is doubtful. All aspherical lenses are very soft and expect extremely caring attitude. Cleaning with a dry cloth will soon result in appearing of small scratches. But if absolutely necessary, it is possible.- An aspherical lens with a special hard coating for tinting. It is a good version for big diopters, but the level of saturation can be only slight or medium, working lifespan can be limited by a couple of years. Though, these years will be full of bright colors and joy. Unfortunately, this version can be ordered only from few manufacturers.
It not only gives the maximum protection level but excludes disturbing patches of sunlight and has a high level of crashworthiness. It is very convenient while driving, fishing or skiing at a ski resort. Polarisation is offered by manufacturers with different degrees of glass refraction (width) and curvature but with a limited range of colors and only with a high saturation level of the filter. Disadvantages are high price, separation at high temperatures and pressure, low chemical stability. The angle of polarization should be put attention to while fitting.
This is a very eye-catching and trendy version which can be used with any type of lens. It is important to take into account that the darker is the base lens’ color the brighter is the mirrorlike impression. If the saturation level of tinting is low, mirrorlike effect appears both out and inside which can be uncomfortable in case your glasses position is far from your face. Even slight scrapes are well seen on the mirror surface. That is why, it is better to choose only well-known European manufacturers providing quality hard coating.
ERP filter or extra UV protection can be used with any type of lenses. Besides improving the protection level, this filter provides absorption but not reflection of UV rays off the surface. It is essential if you are going to a ski resort or to a desert where sun rays reflect off snow or sand and can influence your eyesight reflecting off the inner surface of the lens.Blue Blocker is a special filter which holds the short wave “blue” part of the visible spectrum that disturbs the retina and is badly diffracted by occular media. As a result, the image contrast and the comfort of using a sunprotective lens improve. It is helpful for eye health but a pure Blue Blocker is orange-bricky. It disturbs color rendering. That is why, it is a good idea to use it at minimal saturation level or as a base for other colors.
This lens conforms to light conditions. It is dark in the sun but it is light indoors. Color choice is limited but there is a wide range of diopters, various coatings, high-index versions. The drawbacks are high price and the possibility to be mistaken while choosing a brand, as both dark and transparent versions look equally well. However, comfort in use is guaranteed. Availability of samples can help your choice.
This is the most widespread version for sunprotective glasses without a diopter and the most problematic for individual production. High strength makes the material irreplaceable for substandard types of fastening and rimless frames. But protective coating is factory-made. So, we have to choose ordinary warehouse versions and available colors.
Order sunprotective glasses due to your prescription and the diopter will be only the reason to make your acquaintances open their eyes, looking at your new image, which is in tune with fashion and season.
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