Progressive lenses are designed to have increased reading power the further down you look in the lens. In addition to the measurements for digital lenses described above, we also need to know how much your eyes turn inwards for near viewing. This is known as your “near PD” and measuring this accurately ensures correct placement of your reading corridor. If this is not done properly, you will have a very narrow field of clear vision find yourself “hunting” for a clear image.
These lenses are the most confusing for the consumer since there are over 800 designs of progressive lens! Each one is unique in how the power transitions from distance to near. Those with higher distance demands prefer the reading area lower down, those who read a lot prefer it higher up. Some lenses are designed with wider distance and reading zones but have a very narrow computer zone, others have wide computer viewing zones but more side blur at distance. There is no perfect progressive, the design choice is based on what you need the most. For those that need very wide reading areas and don’t mind a line, there are always traditional bifocals.
Higher end progressives will have less side blur because the prescription is controlled for points further from the corridor. These digital progressives take the frame fitting characteristics into account just like the digital single vision lenses described above to provide a truly customized lens for optimal vision. There are also designs that equalize the magnification difference between lenses, this is especially important if your prescription is quite different between eyes.
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