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 (dioptre) 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 instance to see things displayed on a monitor. 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 customisation.
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