Convenient and precise vision – at a distance, close-up and in all transition ranges: Progressive lenses provide the best solution for vision problems. However, they are also one of the most complex solutions. Did you know that a customized progressive lens takes several hundred hours of development, design and production time to complete?
Actually, this is hardly surprising considering that the lens has to achieve a virtual technical miracle. It is expected to correct both far- and near-sightedness, and allow the user to enjoy perfect vision every step of the way, even in the transition ranges - certainly not an easy feat. To improve close-up vision, the strength (diopter) of the lens must be increased.
Consequently, all progressive addition lenses are more concave in the bottom portion. The top portion of the lens provides long-distance vision and the small section between the two – the so-called transition or progression area – ensures perfect vision at all progressive distances, for example when you look at a computer screen. As a result of the manufacturing process, the edges of this area are out of focus – and the severity of this differs depending on the quality of the progressive addition lens design and the level of customization.
Specific design parameters that make ZEISS progressive lenses so unique minimize these distortions and allow the wearer to enjoy comfortable vision at all distances.
A general rule: The greater the level of customization of the progressive lens design, the better the quality of vision the user will be able to enjoy. Unlike other manufacturers who do not make the custom adjustments until the final stage, ZEISS takes the individual values of the customer into account from the start, during the lens production process.
The differences between this type of lens and a standard progressive addition lens are amazing. It takes much less time to get used to these glasses; the wearer will not have to move his head around as much to adjust to the glasses and will enjoy natural, large-scale vision at every range. This makes reading comfortable, driving a car safe and work a lot less tiring.
To attain this production level, ZEISS utilizes what are known as freeform production processes. The background: Standard progressive addition lenses place the progressive addition area in a fixed place on the front of the lens, while the back end is used to provide the actual focal strength. This creates an obstacle that is difficult to overcome when adapting the lens to your eyes.
The freeform production method allows the relatively random distribution of the progressive addition areas and the prescription strength of the glasses to the front and back sides of the progressive addition lens. Hence, the design can be perfectly aligned with the needs of the customer – and upon request a personal engraving can also be added (for instance, the patient’s initials).
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