Good spectacle lens coatings are a constant issue among spectacle wearers. It's the quality of the coating of spectacle lenses that makes the difference: How robust is a spectacle lens coating? How long is its service life? The DuraVision® Platinum technology, supplied by Carl Zeiss Vision, provides the hardest ZEISS spectacle lenses of all time. This technology provides you a new quality of spectacle lenses and coatings.
Life is made up of many challenges. Even your spectacle lenses have to withstand a lot every day. Don't have a microfibre spectacle cleaning cloth to hand? Quick, careless cleaning is one of the things that damages spectacle lenses the most. Tiny dust particles on your handkerchief, shirtsleeve, or jacket cuff and on the glasses themselves can scratch the spectacle lens coatings. That's why you should prefer spectacle lenses that are robust enough to face all these challenges with you.
What do today's spectacle lens coatings have to be able to do? One obvious thing is a high-quality anti-reflective coating that lets you see better and look better. This is taken care of by several anti-reflective coatings on your spectacle lens that prevent light coming in at different wavelengths and from different directions from reflecting – in other words, they minimise the result light reflexes.
We speak of "residual reflections" in this context, which any spectacle lens still has in spite of an anti-reflective coating. Instead of the colour green, which is usually used in many conventional spectacle lenses as the tint for these residual reflections, blue is selected. Because of its different colour wavelength, this reduces the residual reflection by 20 percent more than conventional spectacle lenses with a green residual reflection.
For ZEISS, the area of spectacle lens coatings has always been extremely important and plays a vital role in the further development of vision solutions. This is above all for historical reasons, because ZEISS is a pioneer in the development of spectacle lens finishes and developed the first anti-reflective coating (worldwide) back in 1935.
The development of DuraVision® Platinum was preceded by intense market research. This confirmed that people who wear spectacles with plastic lenses place a lot of importance on having a lens that is as hard and resistant as possible. For this reason, modern spectacle lenses not only have to have high-performance anti-reflective coating, but must also meet the following requirements (click on the pictures to enlarge):
Thanks to the DuraVision® Platinum technology, the resistance of ZEISS spectacle lenses is significantly increased. Multiple practical tests have proved this during internal performance testing. For example, conventional ZEISS spectacle lenses with former generation of ZEISS AR coatings and spectacle lenses coated with DuraVision® Platinum were subjected to a realistic hardness test. Cloths with a standard amount of soiling were used to simulate a cleaning intensity that corresponds to the total average time (2–3 years) spectacle lenses are worn. We investigated what marks and damage the individual lenses bore after this. Unsurprisingly, spectacle lenses with DuraVision® Platinum technology were at the head of the class and showed almost no signs of wear.
Spectacle lenses with DuraVision® Platinum technology are made up of nine ultrathin layers that are applied directly to each other. These layers have four tasks to perform: first the base glass is hardness coated, followed by the different anti-reflective coatings including an antistatic layer, finally followed up by the Clean Coat. This topmost layer seals the lens and creates a perfectly smooth surface. Dirt and moisture drip off, making it easy to clean the spectacle lens perfectly.
The secret of DuraVision® Platinum, however, is the ion-assisted coating technology. Special ions transfer their kinetic energy to the spectacle lens. In the Carl Zeiss coating systems, the lenses are "bombarded" with these ions over and over throughout the coating process. This ensures optimum compaction and adherence of the individual layers to each other. This closely bonds the otherwise "loose" layers to each other. This way, the individual layers can be joined together in a perfect fit, like a three-dimensional puzzle. Of course, this process takes place at the micron range and is not visible to the naked eye. The result is a lens surface that is three times harder than the previous generation of ZEISS plastic lenses*. This very smooth and hard surface finally makes it possible for spectacle lenses to be more robust, dirt-resistant, and easy to clean.
Whether with or without DuraVision® Platinum – give your spectacle lenses a good, professional cleaning so that the lens coating will last for a long time. It's best if you always remove dirt and dust from your glasses before cleaning them with a microfibre cloth, under running water, or in the ultrasound bath at your optician's location.
*ZEISS lenses with DuraVision® Platinum technology in 1.67 compared to LotuTec in 1.67.