Good glasses are not necessarily reflected in the price. Generally speaking, the quality of optometry and the accuracy of processing are the most important.
The price of glasses is reflected in the frame, and those that meet the national standard are good lenses.
Two. Framework:
The only truly well-known glasses brands are San Ao Shi, Rudenstock and Chas.
Japanese frames are of good quality, while western frames look good.
Ye Qi, Seiko's picture frames are of good quality and cost-effective, suitable for ordinary income friends. The price is set at 200-800, which is suitable for buying Ye Qi. If it exceeds this price, you can buy Seiko.
The price of weeds is lower than Seiko's, but the quality is still the same. This is everyone's choice. Seiko frames look good.
A good spectacle frame 1 is beautiful, light in weight, strong in sweat resistance, elastic and exquisite in workmanship, and the size of temples and trademark seals are better than those printed.
From the material point of view, 1, copper plating (domestic shelf resistance). 2, nickel alloy electroplating (mirror frame mainstream, mid-range products, but long-term electroplating will cause skin allergies). 3. Titanium alloy TI-C has good elasticity, light weight and moderate price, but there are not many products. 4. Pure titanium TI-P is light in weight, good in elasticity, easy to process, easy to form, strong in sweat resistance and durable, but it is difficult to weld glass when it is desoldering. Please pay attention to the steel seal with TI-P logo on the temples when buying. It is the main material of high-grade glasses. It was invented by the Japanese, so Japanese brands are used the most. 5. Memory alloy (superelasticity) is also a kind of frame material, but it is easier to bend and has strong deformation resistance. Note: more than 75% of titanium is titanium alloy TI-C, and pure titanium is Ti-P.
3. Lens texture:
There are two kinds of resin sheets and glass sheets.
Advantages: 1, glass sheet is more wear-resistant than resin sheet, thinner than resin sheet to the same extent, and cheaper than resin sheet.
2. The resin sheet is lighter than the glass sheet, which is not fragile and suitable for frameless.
Disadvantages: 1, glass is easily broken and heavy; 2. The resin sheet is thicker than the glass sheet, which is not wear-resistant and easy to yellow after a long time.
The hardened resin sheet is more wear-resistant, but now all the resin sheets are hardened.
The function of the coating is to reduce ultraviolet rays, increase light transmittance, and wear resistance is the same.
Essilor France is famous for making resin tablets and is the best brand of statistical fat tablets. Essilor mainly produces resin sheets, and most other materials are fake. Essilor lenses have original packaging bags, which are very beautiful. You can request inspection. The lens is very white, so it is not easy to deform when looking at the object. It is not easy to yellow after long-term use.
SOLA resin lenses are very affordable, and many large companies in Shanghai sell this brand best.
Corning glass lenses are good, produced by private investment enterprises in Singapore, with low price and good quality.
Nikon lens price: 500 yuan, but it's too famous.
Four. Lens technology:
Coating: suitable for friends with stability (many advanced cameras are coated, advantages: 1, increased light transmittance (up to 99. 5%)2, is to prevent ultraviolet rays (reduce the occurrence of cataracts) 3, beautiful, no reflection (obvious when taking pictures).
It's easy to distinguish the coating, just look at the reflection of the lens. Reflective color is coating, green light is green film, blue light is blue film and so on. And anti-white light is not coated. Coated lenses generally have high definition.
Aspheric ultra-thin lenses are suitable for friends with deep degrees. They are made up of thin films with and without degrees around them. Because there is no degree around them, they can be made very thin and reduce weight, so there seems to be a dividing line. Although it is not obvious if you don't look carefully, it is different from everyone's glasses. Alias straw hat film (for farsightedness) and pool film (for myopia). There are both glass sheets and resin sheets.
The thickness of the lens is not only related to the degree and size of the lens, but also related to the refractive index. At the same degree, the higher the refractive index, the thinner the lens. The refractive index of each substance is fixed, glass is fixed, crystal is higher and diamond is the highest. Therefore, glasses usually have different refractive indexes, and the composition of lenses is already different. For example, lenses with refractive indices of 1.6 and 1.7 are different in composition, and some other mineral components will be added. To improve the refractive index.
Verb (abbreviation for verb) glasses maintenance:
The simplest: please insist on washing. If there is oil stain, you can smear it with detergent, and then rinse it with clear water to make it as bright as new.
Optical shops often use ultrasonic cleaning to remove green rust through vibration, or they can unscrew the screws themselves and wipe them with napkins.
Avoid scratches, high temperature and acid fog erosion, cook without glasses, and enter the hot water shower environment without glasses.
The convex surface of the lens should be upward when it is temporarily placed, and the glasses should be prevented from being put into the box when it is carried with you. Don't put them in your pocket or bag casually, which will easily scratch the film.
If you are a friend with four eyes who sweats a lot, and the glasses feet are made of metal, you can ask the clerk to put a transparent plastic cover on the glasses feet, so that no matter how you sweat, it will have little impact on the skin and glasses.