Lens type 1. Anti-reflective protective lens This kind of lens is coated with a thin layer of magnesium fluoride on the surface to prevent the reflection of strong light, so that you can see things more clearly and not be disturbed by strong light. 2. Colored lenses Also called “tinted lens”, it is to add…
What is antique glasses? Antique glasses refer to the old-style glasses made by hand and assembled in one piece. The glasses produced by the current mechanical assembly line are not included in this list. The glasses are imported. According to research, the earliest spectacles appeared in Italy. The first portrait of a person wearing spectacles…
Commonly used glasses mainly use lenses, prisms, contact lenses, etc. to correct vision to achieve the purpose of eliminating visual fatigue and protecting or treating eyes. There are many types of glasses. Optical glasses and contact glasses are mainly used to correct refractive errors. Correction of myopia: A concave lens with proper focal power should…
The origin and development of glasses In 1268, Roger Bacon first recorded the lens used for optical purposes. In Europe, the first glasses appeared in Italy and were introduced by Alessandro di Spina of Florence. The first portrait with glasses, “Hugh of Provence”, was painted by Tommaso da Modena in 1352. It is said that…
Physical properties of glasses Transparency refers to the clarity of a substance. It is a comprehensive manifestation of material chemistry, purity, hydration and other factors. Usually, light of a specific wavelength is used to express the transparency of a substance by the percentage of the transmittance of a substance sample. The hardness of the material…
Basketball glasses On the sports field, have you ever experienced or seen a scene where the eyes are injured due to body collision or external force? Especially in some competitive sports, due to the fierce resistance of limbs and sports equipment, any small negligence and unintentional collision may cause permanent damage to the eyes. characteristic:…
Rear view reflective glasses A special kind of glasses. The front view is no different from ordinary glasses. After wearing, you can clearly see the situation behind you through the outside of the lens, so that the detective can look forward and backward easily and beware of being counter-tracked. As far as tracking and monitoring…
Use and maintenance of Sunglasses 1. Newly purchased sunglasses must be adjusted by the staff and worn comfortably before leaving. Please fold the left temple first when you close the lens. 2. When wearing glasses, please grasp the temples with both hands and take them off from the front. 3. Wrap it with a lens…
Color changing sunglasses Many car drivers often wear a pair of black glasses when driving. When driving in the sun or snow, this pair of black glasses can protect the eyes from the long-term irritation of strong light. However, when the car suddenly drove from the light to the dark, wearing black glasses became a…
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…
