Color contact lenses are respected by young people who pursue personality and fashion because of their various good-looking colors and styles, which can also make their eyes look big and bright. But do you know what precautions should be taken when choosing and using color contact lenses and their care products? Contact lenses belong to medical devices Let's first look at how to define color flat contact lenses. Contact lenses belong to the third category of national medical devices. They are lenses directly attached to the tear layer on the corneal surface. They can correct ametropia and treat some eye diseases by changing the refractive ability of the eyes. The national definition of class III medical devices is the highest level, which refers to the medical devices implanted into the human body for supporting and maintaining life, which are potentially dangerous to the human body, and their safety and effectiveness must be strictly controlled. It can be seen that color flat light contact lenses are not defined as "cosmetics", but a medical device that must be strictly supervised like artificial heart valves and artificial kidneys. Color flat contact lenses are colored on contact lenses to beautify and decorate both eyes. So, how do these colors adhere to the contact lens? There are usually two ways: one is the "sandwich" method, which is to press a layer of iris like color between two soft lenses. Although this kind of lens reduces the influence of pigment on the eyes, it thickens and reduces the comfort of the lens. More importantly, it affects the oxygen permeability of the lens, which easily leads to corneal hypoxia and affects the normal physiological metabolism of the cornea; The other is direct coloring on the lens. This kind of lens has obvious irritation to the eyes, and the attached pigment will also affect the oxygen permeability of the lens. Choose to buy correctly According to the relevant regulations recently issued by the State Drug Administration, we hereby remind you to pay special attention to the following when purchasing color flat light contact lenses and their care products: ★ purchase from the medical device business enterprise with relevant business license qualification, check whether the purchased product has obtained the medical device registration certificate, carefully check whether the product package has the medical device registration certificate number, manufacturer name, production date and other information, and properly keep the purchase certificate. ★ imported color flat light contact lenses and their care products should also be attached with Chinese labels and instructions. ★ to query the relevant information of the medical device registration certificate, you can log in to the "data query" column of the website of the State Drug Administration. ★ do not buy unregistered products from informal businesses or online shops for cheap prices. When choosing color flat contact lenses, in addition to the above product information, we should also pay attention to whether the parameters of the lens match the radian of the cornea of the eye. Because if the lens is worn too loosely, the comfort of wearing the lens will be significantly reduced, which may also lead to corneal epithelial damage, lens displacement and other situations. If the lens is worn too tightly, although the foreign body feeling will be reduced when wearing the lens, this is not a good phenomenon, because wearing the lens too tightly will make the lens tightly adhere to the cornea, which is more likely to cause corneal hypoxia, resulting in serious complications. Precautions for wearing glasses must be known There is also a strict time limit for wearing color flat contact lenses. Generally, contact lenses should not be worn for more than 8 hours every day. For contact lenses with poor permeability, the wearing time should be shortened. It is recommended to use it for a short time in necessary occasions. Do not wear it from morning to night. Wearing contact lenses for a long time can easily lead to corneal hypoxia, corneal damage, and even serious eye diseases such as keratitis and conjunctivitis. So, how to safely wear color flat contact lenses? First of all, color flat contact lenses are not suitable for everyone. Before purchasing color flat contact lenses, you must go to a regular institution to have a comprehensive examination of the eyes, including anterior segment, fundus, intraocular pressure, diopter, corneal curvature, corneal endothelium, tear secretion, etc. through these examination results, you can judge whether you are suitable for wearing color flat contact lenses. In addition, professionals should also know the family history and past history of the wearer, and whether there are genetic, immune and other diseases, because these systemic diseases will also affect the safety of wearing glasses. Secondly, on the premise that contact lenses are suitable for use, we should also choose lenses that match the radian of the cornea. A good fitting state is the basis for ensuring safe wearing of glasses, and the correct lens care method is the guarantee for safe use. In addition to strictly controlling the time of wearing glasses as mentioned above, the following nursing requirements should also be borne in mind: ● before contacting contact lenses, be sure to thoroughly clean your hands, do not leave long nails, and avoid polluting or damaging the lenses. ● the lenses should be carefully cleaned before wearing and after removing. ● after the lens is removed from the eye, it must be soaked in a special nursing solution for disinfection. ● except for the special nursing solution, contact lenses cannot be soaked in other liquids. ● if makeup is required, wear contact lenses before makeup, and remove contact lenses before makeup. ● it is not recommended to wear contact lenses in case of bathing, swimming, heavy sandstorm and dirty air. In addition, any contact lens has a service life. Everyone should replace the lens regularly according to the service life of the lens. Even if the lens has not expired, it should be replaced in time if the lens is damaged. Wearing glasses beyond the time limit is easy to cause keratitis and conjunctivitis. Only by carefully following the correct nursing methods of contact lenses, can we ensure the safety of wearing glasses. (outlook new era)