Preservative-free eye drops are mainly artificial tears, such as sodium vitrate and polyvinyl alcohol eye drops, which can be used for the treatment of dry eye for a variety of people. Clinical preservative-free eye drops mainly include artificial tear drops, such as sodium vitrate eye drops and polyvinyl alcohol eye drops, which have a lighter impact on the overall environment of the ocular surface and less irritation. Artificial tear-based eye drops are primarily used to treat dry eye, lubricating the eye surface and relieving patients of discomfort. When purchasing or using eye drops, patients are advised to check the ingredient list in the instruction manual or consult their doctor for preservatives, as well as to use them for a short period of time to prevent infection.