AALEN/Germany, 06.10.2015.
Most spectacle wearers are also car drivers and experience discomfort or vision impairment when it gets dark, rainy or misty. The disproportionately large number of traffic accidents after nightfall shows their concerns are justified. 83% of spectacle wearers use cars and the vast majority (72%) of them are interested in having a single pair of spectacles to provide an everyday solution that can also cope with the special challenges of driving. Car-driving spectacle wearers feel discomfort, especially in rain (94%), at dusk (88%), at night (76%) and in fog (74%)1.
ZEISS DriveSafe lenses are designed to maximise safety and comfort for car-driving spectacle wearers and can nevertheless be used all day. A new premium coating and a state-of-the art lens design technology make this possible. The new lenses address the major challenges facing spectacle wearers while driving in difficult light and weather conditions, resulting from dim light, fog or rain.
More safety with modern car headlamps. But also more discomfort glare for oncoming drivers
The discomfort glare is very often attributable to the spread of modern headlights and to the fact that the driver's sight is changed because their eyes have to adapt to dusk and darkness and they see differently . High-intensity discharge (HID/Xenon) and LED headlamps are brighter and provide better road lighting. Drivers appreciate the increased visibility of their surroundings provided by these lamps. But the increasing prevalence of vehicles with these new headlamps has led to complaints about glare from oncoming cars.
The severity of the discomfort glare grows in general as the brightness of these light sources and its influence on the visual system increase. Discomfort glare is a matter of subjective perception and seems to be dependent on the spectral composition of the source of glare.
The ZEISS DuraVision DriveSafe antireflective coating has been designed for a light transmission spectrum that optimises protection against discomfort glare in the presence of Xenon/ HID and LED headlights.
To assess the effectiveness of the ZEISS DuraVision DriveSafe coating versus two other premium ZEISS anti-reflective coatings, a study compared its efficacy for visual comfort while being subjected to glare and for perceived glare under controlled setup conditions. ZEISS DriveSafe Coating was strongly preferred by almost 50% of test subjects over the alternative coatings, and was seen as being most comfortable in order to see the low-contrast optotype while being glared with the white light LED setup 2. The new coating was rated best for least perceived glare compared to the other premium AR coatings.
Although the new coating can reduce perceived glare by reducing a portion of the visible spectrum, it still ensures maximum ability to see the surrounding environment for safe night driving. Like the ZEISS DuraVision Platinum coating, the lenses coated with DriveSafe are very robust, dirt-resistant and easy to clean while offering first-rate anti-reflective properties.
The challenge of complex visual tasks while driving
Driving presents a complex and changing set of requirements, may it be varying light or weather conditions. Drivers must contend with a rapidly alternating set of circumstances that require them to constantly redirect their attention.
There are only a few other situations in daily life with similar high demand for dynamic vision like driving a car. So even for single vision lenses, but particularly with progressive lenses, it is important to map the distribution of optical power in a spectacle lens to the spatial and temporal composition of the environment and tasks.
One requirement is the view of the road ahead to anticipate future turns and any required acceleration or stopping. Another is peripheral awareness of spatial location within traffic flow as well as the detection of potential threats posed by other drivers or road hazards. Yet another is the information presented in multiple visual displays on the instrumentation panel both straight-ahead and to the side. These requirements are compounded by the need to check several mirrors in order to remain aware of traffic that is approaching from behind.
The dynamics of the vision process while driving include changes of gaze direction, convergence and accommodation. Both the focus of attention and the visual dynamics are powerful influences on driving safety3.
To better understand the requirements for dynamic vision while driving a car, ZEISS commissioned a study by the Research Institute of Automotive Engineering and Vehicle Engines Stuttgart (FKFS) using a modified car in a real world course. The setup included head and eye tracking systems to observe drivers' visual behaviour.
The study found that drivers focus on the road ahead and distant moving objects about 97% of the time, look at the dashboard 2% of the time and alternate viewing dynamically between the several rear-view mirrors 1% of the time4.
In the visual dynamics of driving, head and eye movements interact and are coordinated. Progressive lens wearers need to move their heads more than single vision wearers do in order to avoid zones that do not provide the correct addition power for the task or that have higher levels of aberration. A further finding of ZEISS's research is that the closest object viewed on the instrument panel is approximately 50-75 cm away from the driver's eye. This implies that while driving, the near zone of a progressive lens, designed for a much closer distance, is virtually unused.
The new ZEISS DriveSafe lens design was established to provide excellent visual dynamics. Therefore the lens design is optimized for adjusted pupil size as well as for uncompromised distance vision. Because quick glances at the instrument panel are essential
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AALEN/Germany, 06.10.2015. 
