For most people, putting on a new pair of glasses should be a pleasant thing. But…..
Do you feel dizzy when you wear new glasses?
As we all know, in the process of a pair of glasses from the lens to the completion of processing into a complete frame glasses, we need a lot of professional data to make the finished glasses perfectly fit its owner.These professional data include SPH, CYL, pupil distance and pupil height of customers. These data are indispensable for all processing processes.
However, in these necessary data, pupil height is not well known, and even some practitioners in the glasses industry have a serious lack of understanding. At this time, the wrong pupil height has become the main reason why many customers are uncomfortable after matching.
(1) What is pupil height ?
Pupil height refers to the position of the pupil reflection point of both eyes in the vertical direction of the lens after the frame is worn on the face. Professionally speaking, the distance from the bottom of the lens to this point is called pupil height. Pupil height does not belong to the category of optometry data. It belongs to a data whose importance is equal to pupil distance that needs to be measured before processing.
（2） Why did I seldom hear of high pupil before?
Since about 2015, large round frames have suddenly become popular in the international market, possibly due to the influence of the trend of South Korea and Japan. Before that, the frame height of the mirror frame in the international market was generally not high, and the frame height of 35mm was relatively high. Most frames are frame height between 25-32. Because the frame height itself is not high, the error between the position of the pupil and the vertical direction of the actually processed optical center point is very small, so it is not necessary to consider it in the processing process. Therefore, the public rarely knows the importance of pupil height data, and even practitioners do not know the concept of pupil height data.
（3）What is the importance of pupil height?
With the increasing shape of the frame, if the pupil height is not considered at this time, it is undoubtedly unscientific to make the optical center point on the middle line of the frame!
This will cause the visual center point to deviate seriously from the center line of the frame. When the two cannot coincide, the deviated visual center will deviate from the optical center, which will lead to the symptoms of dizziness of the glasses wearer! The common sense of the public is that only through the optical center of the lens can the eye see things clearly, comfortably and reduce deformation. When the visual center point is farther away from the optical center point of the lens and reaches the edge of the lens, the visual effect will be worse.
I believe that after reading the above article, you have understood the importance of pupil height data.
In the process of glasses processing, if the optometrist does not consider the pupil height of the patient, the processed glasses will produce prism effect. The higher the degree of the patient, the more the deviation of the visual center, the more obvious the prism effect of the glasses. This will cause glasses users to be easily tired, see things distorted and blurred, the degree of myopia will increase rapidly, and the old flowers will be in advance!
In the field of optics, product sales has never been the main purpose of enterprises. As a part of medical related products, only their own continuous learning is the greatest responsibility to customers and patients. Glasses and patients will never match perfectly, but the pursuit of perfection should be the lifelong goal of every optical practitioner.
JAB Optics
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