Primary and secondary school students are in a period of vigorous growth and development, and the visual axis of the eyeball has not yet been finalized. If they wear contact lenses prematurely or continuously for a long time, it is easy to produce side effects such as corneal hypoxia and physiological and metabolic disorders. If the lens is not strictly cleaned and disinfected, it will cause secondary infection; If the lens labyrinth does not adapt to the cornea, it will also cause corneal abrasion and epithelial shedding, and in severe cases, it will lead to corneal ulcer or perforation. Therefore, if primary and secondary school students have no special needs, it is better to wear frame glasses.
Cold patients often carry a lot of germs on their hands, which can easily enter their eyes when taking or wearing contact lenses. In addition, colds are often accompanied by mild retinal inflammation, and wearing contact lenses will aggravate the inflammation. Many colds, coughs and painkillers contain ingredients to suppress tears. Reduced tear secretion will make contact lenses too dry, reduce transparency and affect vision.
The complications easily caused by people with allergic constitution wearing contact lenses are mild inflammation, itchy eyes, redness, conjunctivitis and eye swelling. If these diseases are not treated for a long time, they may endanger vision. If allergic people must wear contact lenses, it is best to use them only during the day and stop using them at least once a week. If there is inflammation, it is best to stop using it. If the inflammation is still not relieved after 2 to 3 days, you should go to the hospital immediately.
If patients with glaucoma, chronic dacryocystitis, conjunctivitis, corneal ulcer, hyperthyroidism and other diseases have been equipped with contact lenses, and their eyes are in the inflammatory stage, they should not be worn until the inflammation disappears.
When a fever patient has a fever, the local resistance of the eyes decreases and the secretion of tears decreases. Bacillus subtilis will multiply in large numbers, and the metabolites of bacteria will be deposited between the cornea and the lens, which will reduce the oxygen permeability of contact lenses and interfere with the normal metabolism of the cornea, thus causing bacterial corneal ulcer.
When cycling tourists ride for a long time, the air convection accelerates, which reduces the moisture of soft contact lenses, and the lenses gradually dry and harden, and the eyes will feel uncomfortable. Over time, hardened lenses can damage the cornea, leading to eye pain or bacterial infection.
After the middle-aged and elderly people reach the age of 40, the eye tissue will obviously degenerate. The local resistance of eyes decreased, especially the ability of eyeball to tolerate hypoxia decreased. At this time, if you wear a thin lens on the surface of the eyeball, it will lead to hypoxia of the eyeball, which is prone to complications such as corneal infection and ulcer. Middle-aged people aged 40 to 60 can wear contact lenses for a short time, and it is best not to wear contact lenses for the elderly over 60, otherwise it will easily lead to serious complications and permanent vision damage.
Pregnant women are not suitable for wearing contact lenses. During pregnancy, because the secretion function in the human body has changed, the barrier function of corneal tissue has decreased, the secretion of tears has decreased, and it is uncomfortable to wear, so it is best not to wear it.
The severity of eye diseases is related to the cleanliness of lenses. If the cleaning and maintenance are not done well, dirt will accumulate on the lens, which will not only reduce the service life of the lens, but also cause irreparable damage to the eyes.