How to choose glasses 2: choose the right frame, lens. Consumers should choose different styles of frames according to their age and occupational characteristics; because everyone's face is different, the pupil distance is different, the refractive error is different, the size of the frame should be different from person to person; there are glass and resin lenses, consumers can choose according to their own preferences.
Currently used lens materials are divided into: glass lenses; resin lenses; PC lenses; which glass lenses refractive index is stable, good abrasion resistance, optical performance is stable, but heavier, easy to rupture. Glass lenses: stable refractive index, good abrasion resistance, stable optical properties, but heavier, easy to break. Resin lens (CR-39): light, safe, high light transmission, not easy to break, but the surface is easy to wear. pc lens: high refractive index, solid, but the surface is easy to wear.
How to choose eyeglasses 3: Choose eyeglasses to have accurate optometry. Consumers are best to choose hospitals or larger optical stores for optometry. First-time eyeglasses wearers, if the age of 35 years old or younger, should be dilated optometry. Elderly people should also have an optometry test for glasses, and should not buy adult lenses from stalls for cheap, so as not to cause damage to the eyes. After the optometry, consumers should try to wear 15 to 30 minutes, myopia, hyperopia lens wearers should wear glasses to walk, up and down the stairs; presbyopia lens wearers should look at the book, read the newspaper. If there is any discomfort, please ask the optometrist to adjust the lenses in time until you are satisfied.