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.
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