To meet the challenges of everyday life, we need hard, dirt-resistant lenses that are easy to clean. This is precisely what hard, anti-reflective lens coatings offer – but the quality of these coatings can vary greatly.
What makes ZEISS lenses with DuraVision® Platinum AR coating different? These hard and light lenses are very robust, dirt-resistant and easy to clean while offering first-rate anti-reflective properties. An integrated system of coating layers densely packed using ion-assisted deposition results in a lens surface that is three times harder than the previous generation of hard anti-reflective (AR) coated plastic ZEISS lenses and 35 % harder than AR coated glass ZEISS lenses*. ZEISS lenses with DuraVision® Platinum AR coating also have a more cosmetically attractive, blue residual reflection colour that generates over 20% less luminous reflectance than conventional green AR coated ZEISS lenses.
ZEISS lenses with DuraVision® Platinum AR coating are three times harder than the previous generation of hard anti-reflective (AR) coated plastic ZEISS lenses1 and 35 % harder than AR coated glass ZEISS lenses.2
The patented anti-static layer3 prevents the build-up of static electricity. As dust and lint are not attracted to the lens surface, lenses stay cleaner longer.
The super-slick Clean Coat makes lenses very easy to clean. Lenses with high contact angles repel oil and water more effectively. ZEISS lenses with DuraVision® Platinum AR coating have a contact angle of a minimum of 110° (lenses without super-slick clean coat: 95°).
A less noticeable and blue reflection colour increases the light transmitted by the lens, resulting in even better vision. These lenses show more than 20% less luminous reflectance than conventional green AR coated ZEISS lenses.
**Compared with conventional lenses
Why compromise on hardness, dirt-resistance and easy cleaning when you can have new ZEISS lenses with DuraVision® Platinum AR coating?
Following the measurement setup as described in DIN ISO 14577 we used an indentation instrument to determine two critical properties of DuraVision® Platinum:
The technology: a high-resolution nano-indenter
What we improved: surface hardness and crack-resistance of the coating
Similar technology has been used internationally in many different industries in which the hardness of material surfaces plays an important role, e.g. in the development and production of modern precision tools. But so far, it has not been applicable to lenses.
At the forefront of research:
Indentation equipment precise enough for the extremely thin coating layers on spectacle lenses has just recently been developed and was immediately integrated into the ZEISS research lab to help create the hardest ever ZEISS AR coating – DuraVision® Platinum.
600 wipes with 4kg pressure: DuraVision® Platinum still looks like new.
In daily life, most scratches occur when lenses are cleaned with a cloth that has dirt on it, either from abrasive dirt particles that are on the lens when the wiping starts or from dirt particles that are already in the cloth. In the SDWT we use an artificially soiled cloth to simulate damage caused by lens cleaning:
3 times harder than previous generation of ZEISS lenses with AR coatings and 35% harder than ZEISS glass lenses
The use of an electron microscope with 3000x magnification makes the advantages of DuraVision® Platinum clearly visible. While the previous generation of ZEISS coatings tears and peels, DuraVision® Platinum only shows fine lines. Less scattered light is generated and a higher Bayer ratio is achieved.
1 ZEISS lenses with DuraVision® Platinum AR coating in 1.67 compared to LotuTec® in 1.67; In the U.S. compared to Carat Advantage®.
2 ZEISS lenses with DuraVision® Platinum AR coating in 1.5 compared to ZEISS SV sph glass 1.5 with Super ET®*.
3 U.S. patent no. 6,852,406.
* Measured with the Bayer test and conducted using COLTS standard operating procedure and abrasive recommended by COLTS.