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Something you have to know before buying glasses

The following is the glasses frame

1. The structure of the glasses frame



A pair of spectacle frames are usually composed of main parts such as lens ring, nose pad, pile head and lens feet. In addition to the above parts, there are also foot covers, stipule screws, hinge screws, etc.


1. Lens ring (frame): The assembly position of the lens, using metal wire, nylon wire and screws, to fix the lens by groove or drilling, it affects the cutting of the lens and the shape of the glasses.


2. Nose bridge: connect the left and right lens rings or directly connect with the lens. The nose bridge is directly placed on the nose or supported by the stipules.


3. Nose pads: including stipules, stipule boxes and stipules. The stipules are in direct contact with the nose and play a role in supporting and stabilizing the frame. Certain molded plastic frames may not have stipules and stipule boxes, and the stipules are connected to the mirror ring.


4. Pile head: The joint between the mirror ring and the mirror foot is generally curved.


5. feet: The hook is mounted on the ear, it is movable, and it is connected with the pile head to fix the mirror ring.


6. Hinge: a joint connecting the pile head and the mirror foot.


7. Locking block: Tighten the screw to tighten the locking blocks on both sides of the lens ring opening to fix the function of the lens.


Second, the size of the frame

Glasses are a standard product. Like clothes and shoes, they have their own sizes.


The size parameters of the glasses are marked on the temples, bridge of the nose or on the signs. For example: 55-15-145, which means the size of the frame is 55mm, the size of the bridge of the nose is 15mm, and the size of the temple is 145mm.



Explanation of frame size:


1. Mirror frame size: the distance between the inner side of the two sides of the mirror ring at the midpoint of the vertical line of the plane where the mirror frame is located. Generally 33---60mm.


2. Nose bridge size: the wide distance on the horizontal line where the nose bridge of the frame is located. Generally 13---22mm.


3. Temple size: the straightening distance from the center of the frame hinge to the end of the temple, generally 125---156mm tungsten carbon plastic steel.


4. The height of the frame: the outer side of the upper and lower edges of the frame is wider.


5. The outer width of the frame: the distance between the visible areas on the left and right sides of the frame, that is, the distance between the frame and the junction of the two temples. Frames with an outer width of 128mm or less are classified as small, 129mm to 138mm are classified as medium, and those with an outer width of 139mm are classified as large.


6. The inner width of the frame: the distance between the inner sides of the two temples at 60mm behind the plane of the lens circle. This is exactly the contact point between the temples of the temples and the temples of the human body. If this is too tight or too loose, it will affect the wearing comfort.


It is recommended that you use the following methods to understand the size of the frame that suits you, and it will be more efficient when you choose.


Check the parameters of the glasses (usually marked on the inside of the temples);

If your spectacle frame parameters are worn out, you can use a ruler to measure the spectacles you have fitted to get the data;

Go to the optician to try it on and write down the size that suits you.



Third, the style of the frame

Generally speaking, there are three types of frame styles: full frame frames, half frame frames, and rimless frames.


A. Full frame frame


Full-frame glasses are all around the lens surrounded by the frame. The advantage is that the lens is fixed firmly and is not easy to fall off. The frame is fixed by screws, so the screws can be easily unscrewed to clean or replace the lenses. The maintenance of the glasses is relatively easy. Fashion glasses, decorative glasses and sunglasses generally use full-frame glasses. Full-rim glasses give a sense of calmness. The frame can block the thickness of the lens well, so it is suitable for lenses with high numbers.



advantage:


It is firm, easy to shape, and has strong hardness. The full-frame glasses are mostly made of sheet materials, with a sporty and fashionable style, which is pursued by young people today. The full-frame glasses have various styles, rich colors, and can cover part of the lens thickness. The beautiful version is very good. Because the periphery of the lens is completely protected by the lens ring, it is suitable for athletes and children to wear, and can be equipped with lenses with various refractive parameters.


Disadvantages:


The weight of the frame is heavier than other frames.

B. Frameless frame


As the name implies, rimless glasses means that the lens is not fixed by the frame, but is fixed by the temple through a screw through a hole in the lens, which greatly reduces the weight of the frame and greatly reduces the influence of the glasses on the shape.

advantage:


The most intuitive advantage is that the vision is more open and the bridge of the nose is more relaxed.


There are also rimless glasses that will not cover too much of the face, and show the wearer’s own style and temperament more realistically, and the integration with the overall appearance is more perfect, and the wearer can also be better in matching clothes. Flexible and casual.


Because the lens is thinner, it can greatly reduce the pressure on the bridge of the nose, and if the power is too high, the edge of the lens will be relatively backward, which will not only increase the weight, but also make the face look more bloated.


Disadvantages:


The life span will be shorter than that of a normal frame, because there is no frame to wrap the lens, and the edge of the lens is easily damaged by sharp objects. Therefore, it is best to put the rimless glasses in the glasses case.


The overall stability of rimless glasses is not good, and they are prone to deformation. All external forces on the glasses will be concentrated on the fixing screws. The lenses are easy to break, and the protective lenses without frames are also easy to wear. In addition, the sides of the lens are all exposed, so it is not suitable for lenses with high power and thick thickness, otherwise the glasses will feel bulky when viewed from the side.

C. Half-rim frame


The upper part of the lens of the half-frame glasses is wrapped and fixed by the frame, while the lower part is fixed with a ribbon. The weight of the half frame will be lighter than that of the full frame, but the firmness is lower than that of the full frame. The lens is more difficult to remove and requires special tools. Half-rim glasses will give people a gentle feeling.

advantage:


The safety is moderate; compared with the full-frame glasses, the field of vision is wider, and the weight will be lighter than the full-frame glasses after half of the frame is missing, and it is easier to clean and maintain.


Disadvantages:


The firmness is lower than the full frame, and the lens is more difficult to remove, requiring special tools; it is easy to fall, and the firmness is poor.

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