Question 2: What's the difference between optical lenses and ordinary lenses? If you want to know the correct answer, I suggest you compare the lens of the camera with the mirror (if possible), or you can go to Baidu Encyclopedia. This is the answer you want ... sorry, I can't copy it to you ... If you experience it yourself, everything is always good ... Look for it ... I wish you success!
Question 3: What are the surface treatments of optical resin lenses? What is the function of each lens? When meeting the needs of the wearer, the remaining basic elements are optical design and material handling. With the development of modern science and technology, the surface treatment technology of resin lenses has made great progress. Face! It mainly includes dyeing, dura impact-resistant antireflection film and top film dyeing. For beauty and comfort, some lens wearers like the lens to have a certain color, or make the upper part of the lens fade gradually from the lower part. Some competitors who wear 1 hope that the lens can absorb a certain amount of light and is not dazzling under strong light; There are also some osmium mirrors that need the color of the lens to increase the contrast of the object. Because the dyeing process of glass lenses is complicated, it is greatly limited, while the dyeing process of resin lenses is simple and effective, so it is welcomed by opticians and optical shops. [br] The light transmittance of 1 tint dyed in light 50 international standard can be divided into 5 grades, namely 0 grade and 4 grade. [br] The light transmittance of dyeing grade is from arrival to payment. Choosing the color of the beard lens depends on the four primary colors of blue, yellow, red and green, which depends on the personal preference of the corpse. Sometimes it is related to the nature of ametropia. For example, myopia can see things more clearly with brown lenses, hyperopia can see things more clearly with osmium green lenses, and light yellow lenses can increase the visual contrast, which is suitable for drivers driving in foggy days and some people with low vision. When traveling in the snow, the best mirror dyeing juice is gray, which can prevent the reflection of snow on the one hand and increase the contrast of objects on the other. [br] In general, the decrease of light transmittance of lenses dyed gray-green is relatively uniform under oral illumination. Therefore, we say that the chromaticity reduction index of this kind of dyeing mirror is very good. But some dyed lenses are different. For example, when the lens is dyed rose, the mirror gauge will be worn, and when the object is viewed in light, the chromaticity of green and blue in some objects will be reduced, and it is detected that the lens wearer feels that the color of the object is too warm. 0. The dyeing method of resin mainly adopts hot dip method, that is, when using special fixture, hold the left eye lens and release hot dye solution to make the pigment penetrate into the lens layer. The absorption speed of lens pigment, such as lens soaking 1 min, can get very light color, and it can get very dark color without soaking for 2 hours. [br] Some lens wearers want the upper part of the lens to be darker. It is used to see far, and the part of the lens is used to see near. Because the pupil shrinks when you look closely, the color needs to be lighter. At the same time, it is not difficult to soak the secondary lens in the dye. Note that the upper part of the lens is facing down, and then slowly lift it at a certain speed after a certain period of time. The immersion time of the lower part of the lens is less than that of the upper part of the lens, which will form the effect that the upper part is darker and then gradually lighter. However, it must be noted that the reference line of lens trimming must be determined before soaking the astigmatism lens, and then the reference line of the lens should be parallel to the liquid level of dye when soaking. [br] Dyeing should be carried out before the hardening process, because there is a hardening material that is difficult to absorb pigments, such as eternal hardening. However, some hardened lenses can absorb pigments. For example, when buying the lenses of ETV, ask about the nature of lens hardening, or ask the manufacturer to dye the lenses before hardening. However, the color of 1 lens will not fade in common cases because the pigment has penetrated into the lens layer 6 of 10 micron. Under long-term ultraviolet radiation, the pigment will have a strong chemical reaction, but it is very slight. Therefore, the wearer does not need to worry about the fading of the lens. [br] 2 Hard penetrating wear-resistant film is added to the lens. Why should resin lenses be coated with anti-wear film? Both glass lenses and resin lenses will wear out. In daily life, the wearer will inevitably come into contact with dust and gravel, and their main component is silicon. When the wearer wipes the lens, the gravel will produce cow scratches on the lens. Because the hardness of resin sheet is relatively low, it is found that scratches are divided into two categories; The scratch of 1 produced by small gravel is relatively small and can be seen under electron microscope. The scratch is very shallow, and the peripheral light edge has little effect on the wearer's vision. It is not easy for the wearer to find that the scratches are caused by relatively large gravel. Under the electron microscope, the corpse can be seen with deep scratches, rough periphery and sometimes small holes. If this kind of scratch is located in the area where the line of sight passes, it will affect the vision. The central pupil area is 30 mm 24, and China Glasses Science and Technology News is 42,000m. 12.8。 The relationship between anti-reflection film and anti-wear film The anti-reflection film is a very thin film with a thickness of about 0.3 micron. The material is inorganic metal oxide, which is hard and brittle. When plated on the glass lens, the film is not easy to be scratched because the substrate is hard and the surface is scratched by gravel. Why the antireflection film is coated on the resin lens is because of the ratio of the base material to the base material. & gt
Question 4: What is an optical lens? Detachable glass and plexiglass (polymethylmethacrylate) are both optical lenses, but the materials are different.
Question 5: What materials are there for myopia lenses besides optical lenses? Maybe the lenses are too heavy. If it is too heavy, you can choose a resin lens.
Also, if you want an aspherical mirror, you will see things slightly deformed and your glasses will be very tired.
Question 6: The difference between sunglasses and optical lenses is 5 points. Optical lenses are different from ordinary glass lenses. In the manufacturing process, some materials are added to turn it into a white lens to increase the light transmittance. Generally speaking, optical lenses without films are optical lenses, and optical lenses with films are called coated lenses. Ordinary sunglasses are made of ordinary glass or ordinary resin, dyed with valves, or coated with films, which are resistant to infrared rays and ultraviolet rays. High-grade sunglasses are made of optical lenses, tempered glass or polarized lenses, which have better anti-ultraviolet effect.
Question 7: What are optical glasses? Use lenses, prisms, contact lenses, intraocular lenses, etc. Correct vision, eliminate visual fatigue, and protect or treat eyes. There are many kinds of glasses, among which optical glasses and contact lenses are used to correct ametropia. In addition to contact lenses, intraocular lenses can also be implanted to correct aphakia. In addition, there are all kinds of protective glasses, beauty glasses and visual AIDS to correct low vision. All lenses are thin lenses, and their gradual change is the reciprocal of the focal length (meter) of the lens.
The main types are:
① lens
Lenses are divided into spherical lenses and cylindrical lenses. The curved surface of a spherical lens is a part of a sphere, according to which parallel rays converge or separate into convex spherical lens or concave spherical lens. Convex lenses are used to correct hyperopia, presbyopia or aphakia, and concave lenses are used to correct myopia. The curved surface of a cylindrical lens is a part of a cylinder. The axis of the cylindrical lens is parallel to the cylinder, and there is no refractive power in the axis direction, but the refractive power is the largest in the direction perpendicular to the axis. It is also divided into convex cylindrical mirror and concave cylindrical mirror, which are used to correct hyperopia or myopia astigmatism respectively.
② prism
Two lenses, which are not parallel but intersect at a certain angle, are used to treat some eye muscle diseases because of their mutual object image shifting to the tip.
③ Corneal contact lenses are also called contact lenses.
Sticking directly to the eyeball surface can be divided into hard and soft according to the different materials used. The former is made of plexiglass and the latter is made of hydrophilic gel, which can not only correct ametropia, but also treat some eye diseases.
④ Intraocular lens
Immediately after extracapsular cataract surgery, intraocular lens (IOL) was implanted into the lens capsule, and its degree can be calculated according to the preoperative corneal curvature radius, the length of anterior and posterior axis of eyeball and the depth of anterior chamber [1].
Question 8: What is optical processing? What is a spectacle lens blank? The process of processing optical materials, such as crystals, glass (optical glass) and optical resin, which are specially used to make various concave-convex lenses and prisms, into optical parts such as lenses and prisms as required is optical processing, including manual grinding and mechanical processing. Optical glass or resin sheet, cut into materials suitable for processing the shape of glasses, is the blank of glasses.