According to authoritative data, at least 2.5 billion people worldwide wear glasses. In China, the number of people wearing glasses has already exceeded 300 million. These figures are from 2013. So, more and more people are wearing glasses! At present, the common types of glasses we see include framed and frameless glasses, as well as contact lenses, which are very popular among young people nowadays. Compared with framed glasses, contact lenses have higher cleanliness and cleaning requirements. However, whether it is framed or contact lenses, if they are not cleaned properly over time, the lenses will become blurred and people will feel tired. In severe cases like contact lenses, bacterial infections may occur! Especially now when air pollution is severe, dust, cooking fumes, and sweating during summer exercise...... The lenses will get dirty very quickly and there are a lot of bacteria, but we can't see them with the naked eye. The obvious ones might be sweat or oil stains on the lenses. Many people usually spray special cleaning agents onto the lenses and wipe them clean with an eyeglass cloth, or drop a few drops of detergent and rinse them with water. In this way, the lenses are very likely to be scratched, their service life is shortened, and most importantly, the cleaning is not thorough, and the inside of the frame cannot be cleaned. So, optical stores use ultrasonic cleaners to clean customers' glasses. People who have been to an optical store for cleaning will know that as long as they put them in and clean for 1-2 minutes, they will be very clean when taken out. What is the process of ultrasonic cleaning of glasses like? Ultrasonic waves generate tiny bubbles. (Note that these bubbles are invisible to the naked eye because ultrasonic waves operate at a frequency of 40Khz per second, which is extremely fast. Therefore, if we see slight ripples on the water surface, it is normal operation.) Then the water molecules burst, and as long as there is dirt in contact with the water, it will peel off the object. Several ultrasonic cleaners from Kemeng Household are all very suitable for cleaning glasses, such as the KM-900S, KM-880, and KM-890. Their prices are all around 100 yuan, which is affordable for students. Therefore, it is necessary for those who wear glasses to have their own one, so they don't have to frequently go to optical stores to have their glasses cleaned. It can also be used to clean jewelry, watches, dentures, braces, etc. at the same time.