If you really need to wear contact lenses, consider artificial tears. The composition of artificial tears is similar to the tears secreted by the human body itself and has little irritation. However, due to the problem of preservation, artificial tears can also be divided into two categories: preservative-containing and preservative-free. Preservatives have a relatively long storage time and are relatively cheap; Preservatives are generally packaged in small packages, and one tube can only be used once, which is more expensive, but it has the least irritation to eyes. Of course, the best solution is not to wear contact lenses!