How to Choose Prescription Lenses?
If you have myopia and presbyopia, it is suggested that you choose the progressive lenses, because the progressive lenses can meet you to see far and near are very clear at the same time, it is very convenient.
First of all, we need to go to the professional optometry apparatus, only professional optometry, accurate processing is the basic guarantee of wearing experience satisfaction.Second, when choosing a progressive piece, we should choose the design that suits us.Of course, any pair of glasses will have a 1~2 weeks of adaptation period when wearing in the early days, depending on individual circumstances.When choosing the design of the lens what should we pay attention to?
We know that the progressive chip is composed of the remote use region, the near use region, the progressive zone and the interference region.Progressive with long channel, short channel two kinds of design.
Progression lenses with long channels are designed to be softer, just like the long ramp on an uphill slope, which brings less shaking and deformation around the lens and higher comfort for the transition from far to near.
Short-channel progressive lenses are stiffer in design, and the distance between the near and far lenses is closer, resulting in less downspin burden for near vision.
Which design fits better depends largely on the actual situation and specific needs of the wearers.
We can consider from the following three aspects:
A.Backspin force
Some people have poor downrotation (the ability of the eyes to rotate downward), which is reflected in the progressive lenses that need to be lifted up to see closer clearly.
For people with poor backspin, their eyes move beyond their comfort zone of backspin, so they are not used to approaching in this position.
When choosing progressive lens products, the customer satisfaction and wearing experience of short-channel products are much higher than that of long-channel progressive lenses.
Conclusion: The long channel products are suitable for customers with good downspin force, while the short channel products are suitable for customers with poor downspin force.
B.Habits with the eye
Sometimes, people with normal downspin will still report that they need to pull their glasses up to sep to see clearly when they are looking closer. Why is this?
This is because some people's eye habits are such: when he looks close, he will habitually lower his head, leaning over a book or newspaper to read, or habit of picking up a book to read.
For them, even if they see close, they are used to using glasses to see the upper area, so the short channel progressive lens will be more suitable for them, on the contrary, they should choose the long channel products.
C.Face shape
For the channel selection of progressive lenses, it is sometimes necessary to consider not only the first two items, but also the frame we choose.
For example, if you have a small face shape, choose a 28mm high frame and a long channel progressive lens.
When processing, it was found that the far and near area of the progressive lens could not be completely retained in the frame, so the horizontal reference line was used to divide the frame or retain the far area, sacrificing the near area. When picking up the piece, customers said that the definition of the near and far lens was not very good or the near area was not clear.
It follows that when we give our customers smaller frames, the shorter aisle products are more compatible.
Conclusion
Short-channel progressive products are more suitable for the following three groups of people:
Customers with insufficient underspin
Customers who tend to look down or hold their books high Customers who insist on small frames
For young customers who wear progressive lenses for the first time, progressive products with long channels are recommended.
