Are you still looking for a pair of large frame glasses? Feeling that the big-frame glasses are small, stylish and atmospheric? In fact, not everyone can match large-frame glasses, you must know these.
First of all, what is an optical center?
When light in all directions passes through the lens, it will be deflected and the direction of light propagation will change; but there is a point on the lens, when light in any direction passes through this point, the propagation direction of the light will remain unchanged, that is, the outgoing direction and the incoming direction are parallel to each other. , which is called the optical center of the lens.
In glasses, the intersection of the optical axis and the front of the lens is defined as the optical center. In fact, it means that the point of the lens facing the pupil in front of your eye is the optical center point!
Therefore, if you are short-sighted and accompanied by astigmatism, blindly follow the trend and choose large-frame glasses. Wearing large-frame glasses will cause visual fatigue in mild cases, and long-term wear may lead to deepening of myopia!
So this is not a joke, be careful! The reason is actually very simple: the interpupillary distance of the large-frame glasses and the optical center of the glasses frame produce a focus deviation.
Why are big frame glasses biased?
Because, for example, your interpupillary distance is 54mm, and the optical center distance of your large-frame glasses is 70mm. At this time, there must be some deviation in focus, and there will also be a prism effect. To put it simply, there will be deformations when looking at objects, and over time, you will have visual fatigue and headaches.
Visual fatigue will make the eyes sore, and the ciliary muscle is too tired, which will increase the degree of myopia. However, this phenomenon will be avoided for friends who wear medium and small glasses frames.
It is recommended that myopic friends with a degree of less than 200 degrees and no astigmatism wear large-frame glasses, but friends who are higher than 200 degrees and have astigmatism, it is recommended to choose the best frame for comfort!
Large-frame glasses mean that the lenses are also large lenses, and they are not heavy, and the bridge of the nose will be uneven. So, don't blindly pursue large-frame glasses, you see those celebrities wearing large-frame glasses purely for aesthetics.
For the sake of comfort, you can look at leaders at all levels of the country, down to doctors, bank staff and other professional groups with high requirements for long-term eye use, they are all wearing safe and comfortable medium and small Framed glasses.
However, I have to say that there are many types of large-frame glasses! Butterfly-shaped, round, square, heart-shaped, etc... Therefore, glasses manufacturers with small and medium frames need to work hard to improve their styles. Otherwise, it is not that people who like big glasses frame blindly pursue big frames, but the true nature of small frames. I can't see it!
Now that you know the dangers of large-frame glasses, friends who wear glasses must pay attention to online glasses.
