With the development of material and culture, bifocal glasses now act as the special ornament for hairdressing and a tool showing personality. Fashioned clipping makes the frame owns particularity and refined pattern, beautiful as fashion.
According the name, “sunglasses” is use to hide you from sunlight. People usually regulate the luminous flux by adjusting the size of the pupil to under the sun. If the intensity is over human’s ability, eyes will get hurt. Therefore in the open air, particularly in summer, in order to relieve fatigue caused by adjusting sunlight flow and alleviate the damage caused by strong light stimulating, lots of people prevent sunlight with the help of sunglasses.
Tint sunglasses weak the ability to protect. While the rich colors can match various clothes well, they have a good function of decorating. Because of tint bifocal lens‘ verified colors and patterns, it rivets the young, especially the fashion lady.
Special-purpose sunglass has a strong function of concealing the sunshine. It is applied in intensity outdoor like beach, snow-skating and hiking. Which demand high-leveled function of preventing ultraviolet radiation.
People choose sunglasses according to their favor and use. But they pay attention to the basic principle that sunglasses will protect eye safely. Reduce glare stimulus, watching the material clearly without distortion, anti-UV, no distortion of color recognition, identify traffic signals accurately, which should be the basic functions of sunglass.
If the above mentioned functions are not acted well, the sunglasses would not work. What’s worse, the uncomfortable symptoms of head dizziness and eye sore and swelling will appear. Sometimes it also leads to reacting slowly, identifying the color with illusion, watching the materials unevenly and causing traffic accident and so on. So keep it in mind that when you choose a bifocals, pattern and quality should be taken account of.