See whether the glasses enterprise has obtained the production license of glasses products;
Second, see if the optometry equipment and testing instruments of the glasses enterprises have qualified marks;
Third, see if optometrists and producers have certificates;
Fourth, see if the glasses are qualified. The four certificates of glasses enterprises are the premise to ensure the quality of glasses.
The most accurate optometry. It is best for opticians to choose a regular specialized hospital or a larger optical shop for optometry.
Choose the right frames and lenses. Consumers should choose different styles of frames according to their age and professional characteristics. Because everyone's face, pupil distance and diopter are different, the size of the frame varies from person to person; Lenses can be divided into glass sheets and resin sheets, and consumers can choose according to their own preferences.
At present, the lens materials used are divided into: glass lens; Resin lens; PC mirror, etc.
Among them, the glass lens has stable refractive index, good wear resistance and stable optical performance, but it is heavy and easy to break.
Resin lens (CR-39): light, safe, high transmittance, not easy to break, but the surface is easy to wear.
PC lens: high refractive index and firm, but the surface is easy to wear.
Wearing glasses is still recognized as the safest way to correct ametropia. The quality problem of glasses will directly affect the correction effect. A pair of unqualified glasses will cause the wearer's visual fatigue, aggravate the visual decline, and even cause headache, dizziness, nausea, indigestion and listlessness in severe cases. Teenagers, in particular, are in the developmental stage, and they will regret wearing inferior glasses for life.
Glasses should be made of optical glass, optical resin and other materials with good uniformity, stable refractive index and high transmittance, which can intercept ultraviolet rays harmful to eyes. Consumers should not buy glasses made of ordinary glass for the sake of cheapness.
Many teenagers have poor eyesight because of intense homework, watching TV or playing games too much. This condition may be pseudomyopia or true myopia. Be sure to have a comprehensive examination of the fundus before wearing glasses.
If it is pseudomyopia, you don't need to wear glasses, and the symptoms will be eliminated after a period of rest. Once pseudomyopia is put on glasses, it will become true myopia, and it is difficult to recover. In order to avoid misdiagnosis, it is best to find a doctor to determine whether to wear glasses after mydriasis optometry. Children with amblyopia and strabismus diagnosed by doctors should cooperate with the treatment, not blindly or without glasses.
Don't believe the sign of "computer optometry, waiting for you". A pair of qualified glasses must go through many processes, such as optometry, frame selection, glasses fitting, testing, processing and fitting, plastic surgery, re-inspection and so on. And it is difficult to finish it in half a day.
The choice of frames and lenses must be based on optometry prescription, scientific and reasonable, and should be suitable for your face. After wearing qualified glasses, you should see things clearly, without strong discomfort, and you should not have dizziness, nausea, eyeball swelling, tilt and other symptoms.
Patients with high myopia (more than -4. 00D), high refractive index (1) should be considered. 7 or so) lenses; Patients with low myopia can choose lenses with low refractive index. Optical glass lenses have low price and strong surface wear resistance; Resin lenses are light in weight and can generally block ultraviolet rays; The price of ultra-thin resin lens after coating hardening treatment is higher.
Simply identify the quality and authenticity of glasses.
Qualified metal frame, good surface finish, no scratches, two mirror rings with the same size, fine workmanship in each part and delicate solder joints. High quality plastic frames should be moderate in hardness and hand strength. The spectacle frames produced by regular manufacturers all have the words of specification, size and brand.
Glasses made of ordinary glass are often green when viewed from the side. This kind of glass has low transmittance, uneven material, many impurities, stripes, bubbles and so on. , and mostly flat convex or flat concave.
The lens surface should be regular, and there should be no spiral and Huo Guang. The identification method is to hold the mirror frame with both hands in front of your eyes, with the convex surface of the lens facing outwards, and slowly move up and down. Observe distant objects from the inside of the lens. If most objects are still, but some of them are wavy, it means that the lens surface is uneven and has Huo Guang.
Sunglasses are flat lenses and should not have top power. If you have discomfort symptoms such as dizziness and nausea after wearing, you should pay attention to the vertex power of the lens. When the thickness of the edge of the flat mirror is not equal, the phenomenon of visual displacement will appear after wearing it.
We should pay great attention to healthy and reasonable eye habits to prevent myopia from further deepening.