Causes of dizziness when wearing glasses Prism degree exceeded Prism is the distance from the lens to the object, 100 times the lens power of the image point on the object, that is, the ratio of the deviation distance of the imaging point to the distance from the object to the lens is expressed in…
Blue light is part of the natural visible light, and both sunlight and electronic screens emit blue light. Blue light is an important part of visible light. Nature itself does not have a separate white light. Blue light is mixed with green light and red light to show white light. Green light and red light…
In order to make the image quality of various LED light-emitting display devices such as TVs, computers, PADs, and mobile phones brighter and more beautiful, manufacturers often increase the blue light intensity of the LED backlight. With the popularity of these electronic products and permeate all aspects of life, Everyone’s exposure to blue light has…
Harmful performance of blue light 1. Eye injury: Harmful blue light has extremely high energy and can penetrate the lens directly to the retina, causing the atrophy or even death of retinal pigment epithelial cells. The death of light-sensitive cells will result in decreased vision or even complete loss of vision. This damage is irreversible.…
How to clean and maintain optical frames? 1. Use ultrasonic cleaning to remove the dirt inside by vibration. Generally, optical shops have this service, which is basically free. 2. When the lens slot of the full-frame spectacle frame is dirty, you can unscrew the screw by yourself, take off the lens and wipe it clean…
In principle, the curved part of the temple should be just above the fold part of the ear, but pressure should be avoided on the fold part of the ear. If the length of the temples is not enough, the glasses will tilt upward, and the tail of the spectacle frame will press into the…
1. The width of the nose bridge of the glasses is moderate. Consumers can check the spectacle frame by themselves by the following methods: keep the head vertical and look forward, and the spectacle frame can maintain a satisfactory position without any clamping of the temples. If the bridge of the nose is too narrow,…
The selection of spectacle frames must meet the optical requirements: 1. The geometric center size of the spectacle frame should be close to the distance between the pupils of the eyes (less than 4 to 10 mm is better). Taking into account that the lens blank must be centered and cut to fit the spectacle…
Craftsmanship is the quality assurance of the frame, and the craftsmanship of a pair of frames is often reflected in the details. 1. Pay more attention to the welding point of the metal frame to see if there is any crack. Due to the thermal effect during welding, the stress structure of the material is…
How to choose high-quality frames？ 1. Style-look at the trend With the personalization of consumer demand, the fashion function of glasses is being valued more and more. The choice of styles should be combined with current popular colors and popular elements. At the same time, by referring to the corresponding styles to decide what material…
A good pair of frames should be made of materials that are stable, safe, reliable, harmless to the skin, light in weight, strong and not deformed. For customers, they often choose from the practicality of the frame. If the glasses are worn for a long time, you can relax other conditions and choose a lighter…
Titanium eyeglass frames are middle and high-end consumer goods. In recent years, with the improvement of our people’s living standards, the domestic demand for titanium eyeglass frames has rapidly expanded. There have also been many manufacturers of titanium eyeglass frames in China, but their raw materials are still Rely on Japanese imports. Up to now,…
The natural materials used to make eyeglass frames include tortoiseshell, special wood, and animal head horns. Generally, wooden eyeglassses frames and horn frames are rare, and tortoiseshell eyeglassses frames are common. 1. Tortoiseshell frame It is a frame of eyeglassses made from tortoiseshell shells produced in the tropical sea, and is mainly produced in the…
1. Sheet rack Manufactured by cold processing, fine, good quality, durable, most of the non-metallic frames are made of carbon crystal frame made of sheet material: it is characterized by high strength, strong, but the material is relatively brittle, and it is easy to be impacted in winter. Brittle cracks, the way to distinguish the…
Plastic or resin Generally, the non-metallic materials used to make spectacle frames mainly use synthetic resin as raw materials, which are divided into two categories: thermoplastic and thermosetting resin. 1. Celluloid It is a material used to make glasses for a long time. It has been rare in the early 21st century. Celluloid has good…
Eyeglasses frames are required to have a certain degree of hardness, softness, elasticity, abrasion resistance, corrosion resistance, light weight, luster and good color and so on. Therefore, the metal materials used to make spectacle frames are almost all alloys or used after metal surface processing. 1. Pure titanium frame Titanium has a specific gravity of…
The metal materials used for eyeglasses frames are divided into three categories: copper alloys, nickel alloys and precious metals. 1. Cupronickel frame (copper-zinc alloy) The main components are copper 64%, zinc 18%, and nickel 18%. The frame material is the cheapest and easy to process. Electroplating is mainly used to make hinge brackets, small parts…
How many types of frames for eyeglasses? 1. Full frame: It is the most commonly used frame type. It is strong and easy to shape, and can cover a part of the thickness of the lens. 2. Nylon wire frame: a very thin nylon wire is used as part of the frame edge, and the…
How to identify the quality of sunglasses? Look at the appearance of the glasses first 1. Electroplating, baking varnish coating, plate surface polishing and other surface colors are uniform, without obvious blemishes, spots and scratches. 2. The printing, laser and engraving strokes of lenses and temples are clear and smooth, easy to identify, and not…
Sunglasses are a kind of vision care products to prevent the strong stimulation of sunlight from causing damage to the eyes. With the improvement of people’s material and cultural level, sunglasses can be used as special accessories for beauty or personal style. Our eyeballs (lens) are very easy to absorb ultraviolet rays. The damage of…
