1, choose the right lens
The quality of the lens is the most important factor in determining the quality of a pair of glasses. There are currently four categories of lenses on the market: ordinary glass, optical glass, ordinary resin, or PC lenses. Ordinary best place to buy eyeglasses lenses are cheaper and scratch-resistant; Resin and PC lenses are lighter and not easily broken, especially PC lenses, can get rid of rhinitis and headache caused by nose bridge compression, and it is safer for people who love sports. There is the same degree, the higher the refractive index, the thinner the lens, generally, if the degree is high, try to choose a high refractive index lens, so that the glasses will be a little lighter.
Refractive index of lens
Learn to judge the corresponding refractive index according to your own degree, and you will not be fooled.
0-300 degrees 1.56 refractive index
300-500 degrees 1.60 refractive index
500-700 degrees 1.67 refractive index (mark here, for students with high thin thickness requirements, 1.74 refractive index is recommended above 600 degrees)
700 degrees above 1.74 refractive index
The pupil distance is small and the frame is large, the thicker the lens will be, and it is necessary to upgrade the refractive index of one higher grade.
2, choose light to select the frame
Since the frame needs to sit on our nose for a long time, we have to prioritize its weight. A good pair of glasses should be strong, light and comfortable. For people who are more sensitive to the bridge of the nose, choosing a relatively light plate or a light texture of strong tungsten carbon, pure titanium is more in line with health needs. If the degree is relatively high, you can choose a smaller frame to reduce the weight of the glasses. You can also appropriately choose glasses with nose brackets, which can reduce the weight on the bridge of the nose. When choosing glasses, pay attention to the center distance of the frame can not be too different from the pupil distance - small pupil distance should not choose a very wide shelf, otherwise it not only looks ugly, but also uncomfortable to wear. In particular, high myopia should try to choose a small frame of the shelf, otherwise the assembled glasses lens edge appears very thick.
- Optometry
It is best to choose a hospital or a relatively large optical shop for optometry. People who have glasses for the first time, if they are under the age of 35, should have mydriasis and optometry. After optometry, consumers should try to wear 15 to 30 minutes, short-sighted glasses, far-sighted glasses should wear glasses to walk, up and down the stairs; Reading glasses wearers should read books, read newspapers.
- Glasses should be replaced in time
According to the survey, people replace their glasses every 1.5 to 2 years on average. Ordinary myopia patients should generally replace the glasses once every 1.5 to 2 years, one is to adjust the degree, and the other is to "update". Once there are scratches on the mirror of the glasses, it will obviously affect its optical correction performance, so it is necessary to regularly maintain and check the glasses, and update them in a timely manner, so that they are always in good working condition.
