Glasses are simple optical devices used to correct vision or protect eyes, which are composed of lenses and frames. /kloc-At the end of 0/3 century, Italy invented glasses. At that time, glasses could only be said to be magnifying glasses, and they were held in your hand when reading. A pair of glasses frame usually consists of lens ring, nose rest, pile head and lens foot, in addition to the above components, there are foot covers, hinge screws and so on.
At present, the lenses used are basically resin lenses, and the design of lenses is basically aspheric. The selected lens is an aspheric lens made of resin. One characteristic of aspheric lenses is that the optical power of the optical center is higher than that of the periphery, that is to say, if the lens frame is too large and the pupil distance is too small, the machining center will be shifted more. Besides the thick edge, not only can the central dominant optical area not be effectively utilized, but the periphery will also interfere with the vision of the central area.
Titanium alloy frame is a special alloy, and the ultra-light and super-elastic frame can be made very thin. Because the alloy of titanium with rare metals such as cobalt and chromium is very stable, it will not cause skin allergy, and it will be more developed and popularized in the next few decades.
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