How to choose reading lenses_ Nowadays, many people choose reading glasses for convenience, and many people will choose
How to choose reading lenses? Nowadays, many people choose reading glasses for convenience, and many people will choose finished products. But you can't be greedy for cheap, just buy a pair of glasses in the market stall, such glasses have not gone through the formal optometry process at all, most of them are measured by computer refractor plus manual inserts, and the processed glasses do not meet the national standards.
So how to choose reading lenses? (Recommended reading: What are reading glasses, and who is suitable for wearing? LH1502 Men's Reading Glasses Reading glasses lenses are best to choose resin material, this material can effectively resist the function of ultraviolet infrared rays, when wearing it will have a certain fatigue resistance to your eyes, and even if the quality is not good, it may produce some other diseases, in the end, there is no way to treat it, so the plastic lens is much better than the general lens.
When choosing, you should also consider the following points: light, general resin lens is 0.83-1.5, and optical glass is 2.27~5.95. It is recommended to choose plastic lenses. The impact resistance of plastic lenses is generally 8~10kg/cm2, which is several times that of glass, so it is not easy to break, safe and durable.
It has good light transmittance, and in the visible light region, the light transmittance of plastic lenses is similar to that of glass. The infrared light region, which is slightly higher than that of glass, and the ultraviolet region, starts at 0.4um and decreases with the decrease of wavelength, and the light with a wavelength of less than 0.3um is almost completely absorbed. Finally, it is necessary to choose a good pair of glasses frames, in addition to the price and aesthetics as the standard, special attention should be paid to the size of the selected frame and the interpupillary distance as much as possible, because it directly affects the intrinsic optical quality and wearing comfort of the glasses.