Many friends who wear glasses every day have the following experiences: when looking in the mirror, they will find that their glasses are high and low; take off the glasses, and after closing them, they find that the two temples are not at the same angle; after breaking the glasses with their bare hands, they will soon wear crooked; ...
Gallery copyrighted images, not authorized to reprint
When I just put on the glasses, I was obviously good, how can I wear them and wear them crookedly? Is it your eyes or your face? You know, often wearing crooked glasses not only affects the appearance of beauty but also adds depth, the more you wear the higher the degree! Today, we're going to reveal how your glasses are crooked!
How do the glasses get crooked when they are worn?
The glasses that people usually wear, belonging to spectacles, are the most common optical correction tools in daily life. It can not only correct the refractive error of the eyes, but also serve as an ornament. A pair of glasses usually includes spectacle frames and spectacle lenses, spectacle frames can be divided into full-frame frames, half-frame frames, rimless frames, etc. according to the style and structure, generally composed of these parts:
Gallery copyrighted images, not authorized to reprint
Rim - the position of the lens assembly; the temple - the end is usually equipped with an ear hook, hanging on the ear for fixing the glasses; the bridge of the nose - connecting the left and right two rings so that the glasses support the nose; the nose pad - some glasses rely on the nose rest on the ring to support the nose; hinge - connecting the temple to the ring, which is more likely to be deformed or damaged.
After understanding the structure of glasses, let's talk about how glasses become crooked.
1, one-handed removal of glasses is the main reason for the distortion of glasses between the ring and the temple is connected by a hinge, if frequently with one hand to take off, the temple and hinge pull outward, it is easy due to the uneven force on both sides to cause the screw of one side hinge to loosen, resulting in a high and low or a tight and loose temple, resulting in the glasses become crooked.
Gallery copyrighted images, not authorized to reprint
2, everyone's face is not completely symmetrical part of the population of the two ears will also have differences in the height of the two ears, that is, "high and low ears". If the glasses or glasses dispensing mechanism ordered from the Internet are not professional, and there are high and low ears in themselves, there may be a situation where the glasses become crooked. Professional opticians generally fine-tune the glasses again when dispensing glasses to make the glasses fit their faces more closely. With reasonable adjustments, the glasses can generally look horizontal and comfortable to wear.
3, the problem of the glasses themselves, but also one of the reasons for their distortion, such as the material of the frame is soft, hard enough, or the problem of the glasses in the processing leads to the reverse plasticity of the lens on the lens ring is too large; long-term unwashed glasses, frequent opening and closing of the temple, the accumulation of grease dust leads to the loss of hinges and nose pads, which may lead to the distortion of glasses.
4. The deformation of glasses caused by external force such as breaking and crushing usually after taking off the glasses, under conditions, try to put them in the glasses box, or place them in a safe position, so as not to cause damage to the glasses.
What are the dangers of long-term crooked glasses?
The power of lenses, especially for highly astigmatized glasses, is not the same for every angle. If the glasses are crooked, the external light can not reach the pupil through the optical center of the lens, which will lead to the horizontal offset of the pupillary distance and the axis of astigmatism, and the degree of the lens that usually looks through things does not match the actual degree of the lens when the lens is matched. Long-term wearing of glasses that do not match your own degree may cause myopia to deepen faster.
In particular, many parents choose functional lenses such as full focus lenses and multifocal lenses in order to protect their children's vision. This functional lens also needs to record the height of the pupil of the one eye of the person who is matched, and it is more necessary to ensure the correct posture when wearing, otherwise it will not only not play a role in protecting vision, but also accelerate the development of myopia.
Gallery copyrighted images, not authorized to reprint
In addition, crooked glasses will produce a certain prism effect, so that what is seen is deformed, and fatigue is valued. There are also some people who cannot adapt to the unmatched degree of glasses, and long-term wear may also have symptoms such as dizziness and nausea.
How to tell if the glasses are crooked?
A suitable pair of glasses, the two sides of the lens ring should be horizontal, the distance from the upper edge of the left and right lens ring to the eyelid is equal, the eye is roughly between 1/3 and 1/2 of the upper edge of the glasses, the distance from the lens to the eye is about 12 mm, and the lens cannot contact the eyelashes, and the side view lens has an angle of about 8-15 degrees forward tilt. The nose pads and temples on both sides fit comfortably with the face without chuckles or loosening. How do I test myself? First take off the glasses, face up on the horizontal surface, observe whether the opening and closing of the two temples is symmetrical, whether the lower edge of the two lenses and the two ear hooks are stable; then the glasses are facing up, whether the two temples are attached to the table; then close the glasses to see whether the left and right two temples can form a straight line.
How do I correct my glasses?
The first place where corrective glasses can be adjusted is the temples. Bend the temples to make the temples and the back of the ears stick more tightly, while paying attention to the level of the angle of the glasses, you can also add a non-slip sleeve on the temple to further fix the position of the glasses and prevent the glasses from slipping. The second place that can be adjusted is the nose pad. Ordinary glasses are divided into nose pads and no nose pads, glasses with nose pads If the distance between the left and right nose pads is too large, it is easy to cause glasses to slide, and the position and distance of the nose pads can be improved by adjusting the position and distance of the nose pads; for glasses without nose pads, you can choose to stick to the nose pad stickers to prevent slippage, but pay attention to regular cleaning and replacement.
Gallery copyrighted images, not authorized to reprint
It should be noted that for people who do not have any experience in corrective glasses, it is not recommended that you adjust themselves. If the material of the spectacle frame itself is hard, the adjustment of the force is too large, which can easily cause damage to the spectacle frame. In addition, if you only adjust yourself, you may cause other problems with the glasses, further causing damage to the glasses. When you find that your glasses are crooked, be sure to find a professional optician to adjust in time, or replace the spectacle frame in time to avoid causing damage to the eyes. At the same time, it is also necessary to clean and maintain the glasses regularly, and clean the dust in the nose pad and hinge in time to extend the service life of the glasses.
(Popular Science China)
![The alignment of the first phase of the Webb main mirror has been completed[fig]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)