Is it true that contact lenses abrade cornea

commenting expert: Tang Ping, Tongren optometry and matching center Technical Director

correct misunderstanding: contact lenses do not actually directly contact the cornea of the eye

Contact lenses wear the cornea? The contact lens can’t touch the corneal surface. This point has never been noticed by the human body.

Tang Ping, technical director of Tongren optometry and matching center, pointed out that when wearing contact lenses, there is also a layer of “tears” between the lens and the cornea. The lens is equivalent to cutting the tears that play a lubricating and protective role in people’s eyes in half. Therefore, the lens that can not completely remove the cornea of the eye is bound to wear and abrade the cornea directly.

In addition, human corneal cells are not immutable and less and less. They protect the internal tissues of the eye through normal natural shedding and regeneration. If encountering the stimulation of sandstorm, corneal cells will play a protective role and shed, but they can regenerate and recover within 24 hours.

Therefore, the loss of corneal cells in the human eye is not so terrible, and it will not become less and less and eventually blind. What really matters is improper wearing and unclean nursing methods for corneal injuries, such as wearing for an extra long time, corneal infection caused by unclean hands, and then injury.

correct misconceptions: modern production technology rarely does not fit

When it comes to the inconsistency between the concavity of contact lenses and the convexity of cornea, this situation has been found less and less in the current production technology. Tang Ping pointed out that if the concavo convex molding problem is pushed forward ten years, it may occur. However, with the development of medicine and technology, this kind of problem is relatively rare in the outpatient department.

Contact lenses belong to the third category of national medical devices, and their marketing must be subject to strict examination and approval. Therefore, as long as you buy products of regular brands in regular optical shops, you don’t have to worry too much about uneven fitting, oxygen deficiency and other problems.

In addition, the corneal leukoplakia mentioned in the Internet news is caused by the complications of infectious keratopathy or corneal trauma, and has nothing to do with the concavo convex molding of hard glasses, which has a low probability of occurrence.

danger prevention: it is not recommended to wear it in dust and laboratory environment

Contact lenses are the crystallization of the wisdom of modern science and technology, which help humans avoid the inconvenience of wearing frame lenses in many aspects. While discussing the hidden dangers of contact lens wearing, we should also discuss how to correctly select, wear, care for and replace contact lenses.

Tang Ping reminds everyone that people who often stay in a space with a lot of dust and volatile chemical reagents for a long time should try not to wear contact lenses. The reason is easy to understand. Dust and volatile chemical reagents are easy to adhere to and change contact lens materials, which will further affect eye infection and even damage.

prevention of risks: patients with stomach diseases and patients with skin diseases there are contraindications for wearing

People suffering from stomach diseases who need to take “atropine drugs” for a long time should not wear contact lenses, because atropine drugs can affect the normal secretion of human tears, change the composition of tears, and thus can not play a normal protective role between the cornea and contact lenses.

People with psoriasis (commonly known as psoriasis) should also pay attention to wearing contact lenses carefully, because patients with psoriasis are prone to bring skin tissue and bacteria that fall off from the skin of the hands into the eyes during wearing, increasing the chance of eye infection. In addition, diabetes patients, due to the possibility of eye complications of diabetes, are not suitable for wearing contact lenses.

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