Contact lenses, also called corneal contact lenses, are popular among adolescent patients because they can serve both vision correction and aesthetic purposes. However, contact lenses, even with good quality and high oxygen permeability, can hinder the cornea’s direct need for oxygen, which can lead to dry eye, epithelial exfoliation, neovascularization, and giant papillary conjunctivitis. In the presence of bacteria or viruses, they can also easily cause keratitis and even corneal ulcers and perforations. Advice for those who want to wear contact lenses Elementary and middle school students should not wear contact lenses because they are in a period of vigorous growth and development, the structure of various parts of the eye is changing rapidly, myopia is unstable, the curvature of the lens is easily incompatible with the cornea and cause corneal epithelial detachment, or even corneal ulceration or perforation. At the same time, because of the poor self-care awareness and self-care ability of primary and secondary school students, and contact lens wearers have to clean and disinfect their contact lenses every day, if the daily care is not appropriate, disinfection is not strict, will cause secondary infection. If the left and right lenses are misaligned or overdue, they are also prone to complications. Contact lenses should not be worn by people over the age of 40 because these people will experience more obvious degenerative changes in their eyes, such as a decrease in the eye’s tolerance for oxygen deprivation. Certain patients should not wear contact lenses Patients with dacryocystitis, incomplete eyelid closure, keratitis or infection, conjunctivitis or infection, uveitis, glaucoma, and refractive errors that exceed the range of contact lens correction are not suitable for contact lenses. Patients with collagen diseases such as sinusitis, diabetes, hyperthyroidism, rheumatoid arthritis, and systemic diseases such as autoimmune diseases should also not wear contact lenses. Special tip: Don’t wear contact lenses when you have a cold. Because the cold is often accompanied by mild conjunctival, corneal inflammation, fever when the eye blood vessels are in a state of expansion and congestion, it is easy to wear contact lenses at this time to make the inflammation aggravated. And patients often have a lot of germs or viruses on their hands, in the process of taking and wearing contact lenses, germs or viruses can easily enter the eye. In addition, many cold, cough or pain medications contain ingredients that inhibit tear secretion, and a reduction in tear secretion can affect the comfort of wearing contact lenses. Contact lenses should not be worn when taking certain medications. For example, when taking oral contraceptives, the eyelids and cornea may swell; when using sedative and hypnotic medications, the eyelids may open and close incompletely; when using first-generation antihistamines, anticholinergics, and tricyclic antidepressants, tear secretion may decrease. Some medications (e.g., rifampin, fenartrate, tetracycline, and salazosulfapyridine) can discolor contact lenses. All of these medications can affect the effectiveness of wearing contact lenses. Women in menstruation, pregnancy and breastfeeding should not wear contact lenses because eye pressure is higher than usual during menstruation and the eyeballs are prone to congestion, which can cause discomfort and inflammation. During pregnancy, due to changes in hormone levels in the body, the eyelids and cornea may become edematous and the surface of the cornea may not match the normal contact lens, which can have an adverse effect on the cornea. Contact lenses should not be worn under certain special circumstances, such as in a heavily polluted environment with dust and smoke, or in a working environment with acid, alkaline and volatile chemicals. Contact lenses should not be worn for more than 6 hours a day, and should not be worn continuously for more than 10 years, and contact lenses should be used with frames. Special Note: Currently, colored contact lenses and contact lenses are becoming a favorite special type of lens for young people. Although it is extraordinarily beautiful, if there are quality problems with the product, it may cause more damage to the eyes because of color loss. Second, because the diameter of colored contact lenses is generally fixed at 4 to 6 mm, while the pupil of the human eye can expand or shrink with the brightness of light, so when the light is too dark, the diameter of the pupil may exceed 6 mm, thus causing night vision impairment.