The popularity rate of progressive films in developed regions such as Europe and the United States has exceeded 70%, and progressive films account for 30% of the sales volume, with annual sales of about 500 million. However, progressive films are less than 3% popular in the Chinese market at present. With the increase of the aging trend in China and the incidence of myopia among teenagers, progressive film is very useful in the domestic market. Let's talk about the choice of progressive film channel.
1. What is the gradual channel
Progressive channel refers to the degree change channel in which the distance degree at the "10" of the far area of progressive multi-focal lens is continuously increasing and transitioning to the degree of the near area
2. What are the characteristics of the length of the channel
The channel is a process of continuous increase of degree, so when the customer's ADD is determined, different channel lengths have a great influence on the variation range of channel degree. The variation range of long channel is flatter than that of short channel, and the visual field of each area is also different.
3. How to choose the progressive channel
Frame height: Ensure that the progressive far and near reference rings are within the frame height range.
ADD size: ADD≥+2.00 to select the long channel is appropriate, followed by the middle channel; Short channels with ADD≤+1.75 can also be selected. General principles: The larger the ADD is, the longer the channel should be.
Usage: far and outdoor, choose the long channel; The medium and near range mainly selects the short and middle channels.
Original mirror reference: The new progressive channel as close as possible to the customer's original progressive channel.
In addition, the point pupil method can also be used, that is, respectively point out the far time and near time pupil in the support of the reflective spot, accurately determine the length of the channel.
The length of the selected channel must meet the requirements of customers wearing more comfortable, more in line with his eye habit.
Multi-focus progressives provide multiple channels (9, 10,11, 12, 13, 14, 15, 17, etc.) to make channel selection easier.
Post time: Oct-10-2022