Will contact lenses melt when heated in the eyes?

Experts decipher N kinds of legends about contact lenses (original) If you wear contact lenses for a long time and look at the computer, your eyes will easily get cataracts; if you wear contact lenses while eating barbecue, if the lenses melt due to heat, it is no joke... ...There are many similar legends about contact lenses, and they become more and more mysterious as they are said. Although wearing contact lenses is a very common thing nowadays, it can not only change the image, but also is easy to wear. However, no matter what, that thin little thing has to be in close contact with the eyeballs every day, so it is still a bit worrying for first-time wearers. Yesterday, reporters collected several legends about contact lenses and asked experts to answer them one by one. It turns out that legends really can only be legends. Legend 1: Computer people + contact lenses = cataracts Zhuang Weida is a technical engineer of a district-level news website. He is responsible for website production and maintenance, and faces computers for at least 12 hours a day. Recently, a piece of news on the Internet made him quite worried, "Computer radiation will cause the deterioration of contact lenses, and long-term wear will easily lead to cataracts." The source said that contact lenses are now generally made of polymer materials. When exposed to computer radiation, the glasses will gradually decompose and deteriorate, causing the molecules of the original material to mutate. Some of these decomposed small molecules will reach the lens through lymphatic circulation, and combine with the repair tissue of the lens to form new polymers. If there are too many polymers, they will accumulate in the crystal body and gradually form cataracts. "It makes sense. I've been wearing contact lenses for two or three years. I won't really lose my sight one day." He said full of doubts. Legend 2: Don’t wear contact lenses while eating barbecue. “I never wear contact lenses when eating barbecue.” Xu Bo, who works at a bank in Ningbo, said, “If the lenses melt due to heat, it won’t blind my eyes.” To illustrate the accuracy of her point of view, she added another example to the reporter. It is said that in Malacca City, Malaysia, a boy wore contact lenses to attend a barbecue party. A few minutes after lighting the fire, he suddenly covered his eyes and cried and rolled on the ground. Everyone in the room was shocked. After he was sent to the hospital for examination, it was discovered that the contact lenses had melted due to heat, scalding his eyeballs and causing him to become blind. This view is recognized by many contact lens owners. "How can a thin layer of plastic withstand the sustained high temperature? It is better not to wear it." Xu Bo's colleague Gao Minjie said. So, do contact lenses really melt when exposed to heat during a barbecue? Legend 3: Glasses and eyeballs are inseparable. My friend Xiao Han wears a pair of black-rimmed glasses and looks particularly elegant. A year ago, she was a loyal user of contact lenses. What made her completely "makeover"? As he is about to graduate from college, Xiao Han is interning in the media while rushing to write his thesis. As she was busy with work, she forgot to take off her contact lenses to clean them. When she thought of taking them off, she found that the glasses were stuck to her eyeballs. "The pain was unbearable as soon as I took it off, so I simply stopped taking it off for the time being." After three months of "intimate contact" between the glasses and the eyeballs, Xiao Han couldn't bear it anymore. He endured the severe pain and forcibly separated the glasses. "Then my eyes felt uncomfortable for a long time, and I never dared to wear contact lenses again," she said. Improper wearing of contact lenses can easily induce eye diseases such as corneal ulcers and conjunctivitis. What should I do if I encounter Xiao Han's situation and wear it for too long and it sticks to my eyeballs? ■Experts answer questions from professionals: The melting point of contact lenses is 160°C. A professional from an optical shop in Hangzhou said: "You don't have to worry about your contact lenses melting when eating barbecue." He said that the material of contact lenses is not ordinary plastic, but the material of rigid contact lenses. It is a hydrophilic polyacrylamide gel. The material of soft contact lenses is a polymer compound with a melting point generally around 160°C. If people wear it close to a fire source, it will not melt under normal circumstances. However, if it is kept close for a long time, it is easy to dehydrate the glasses and cause a foreign body sensation in the eyes. If necessary, you can put a few drops of antibacterial eye drops appropriately. Doctor: Don’t be lazy when wearing contact lenses. “Wearing contact lenses can cause cataracts. There is no scientific basis for this, but it is really not good to stay in front of the computer for a long time,” said Wang Qing, director of the ophthalmology department of the Municipal Hospital of Traditional Chinese Medicine. “Currently, most people wear contact lenses. Soft contact lenses are not oxygen-permeable, and the cornea will degenerate due to long-term lack of oxygen, and it is easy to form small blisters. If you stay in front of the computer for a long time, the number of blinks will decrease, the tear secretion will also decrease, and the clarity of the contact lenses will also decrease."

Regarding the problems Xiao Han encountered, Wang Qing reminded that contact lenses should not be worn for more than 8 hours, let alone being lazy and wearing them while sleeping. "When you are asleep, your eyeballs will move. Wearing contact lenses will increase the burden on the eyeballs and make the eyes more tired." "Contact lenses have strong adsorption capacity. If they are not removed for several months, they will easily age and cause corneal epithelial abrasions." Wang Qing said that because they were not cleaned carefully, many patients came to see doctors with keratitis. Intern reporters Yu Min Chai Yueying