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.
Good cleaning, less eye problems.
1. Be sure to rub the lens by hand.
Just like the general reason that dirty clothes can't be washed out by throwing them into the washing machine without scrubbing first, contact lenses must be scrubbed by hand for more than 30 seconds to achieve the cleaning effect. The research report points out that rubbing the lens by hand can remove impurities and deposits on the lens more effectively than any machine. In addition, tap water or boiled water has no cleaning and disinfection effect and should not be used to clean contact lenses.
2. Replace new contact lenses every 1 ~ 2 years.
No matter how perfect the cleaning and maintenance method is, there will still be a little microorganism left on the lens. Even if it is not used frequently, the lens material will naturally age after 1 ~ 2 years. At this time, it should be discarded and replaced to avoid eye injury.
3. The lenses should not be stored in normal saline.
Normal saline has no bactericidal effect, and is used to preserve lenses, which is easy to breed bacteria and cause eye infections.
4. Different brands of contact lenses cannot be used interactively.
Because different brands of potions have different types and components, do not mix or replace them at will, so as to avoid chemical action and damage the lenses. In fact, up to now, ophthalmologists believe that there is no contact lens potion without side effects.
Heating disinfection method will not cause the side effects of chemical residue, but heating method is easy to shorten the life of lens; The multifunctional liquid medicine is simple and convenient, and the dioxygen system has the strongest bactericidal power, but the cleaning function of the two systems is poor.
Although the traditional methods of cleaning, rinsing and soaking are troublesome, they are relatively safe cleaning and maintenance procedures for doctors at present.
5. Fixed deproteinization every week
Protein adsorbed on the lens will form a thick layer over time, which is easy to scratch the cornea. Deproteinization of enzyme tablets can decompose protein structure and keep the lens surface clean.
The ingredients contain enzymes, which can remove proteins. He believes that so far, there is still no disinfectant on the market that can completely replace the weekly deproteinization work.
In addition, the effect of deproteinized tablets is not better as long as they are soaked. Dr. Lin Siyuan explained that the soaking time should not exceed 12 hour, because the decomposed protein will re-penetrate into the lens and be firmly adsorbed, which will increase the difficulty of cleaning.
6. Potions also have a service life.
After the potion is unpacked, it is best to use it up or discard it for a new one within 4 months, so as to avoid deterioration of the potion. After unpacking, the service life of physiological saline solution should not exceed 1 month because it does not contain preservatives.
7. Before wearing contact lenses, rinse with normal saline.
Because invisible potions are mostly chemical preparations, it is easy to cause irritation when worn directly on the eyes. It is best to wash it with normal saline before wearing it.
8. Contact lenses should not be soaked in liquid medicine for a long time.
After being soaked for a long time, the liquid medicine loses its disinfection ability and returns to ordinary water, but becomes a hotbed of bacteria. Usually, a new soaking solution should be replaced every two days, but some potions can be sealed for a week, depending on the composition of the potions themselves. Be sure to disinfect and clean it before wearing it.
9. Send it to the original factory for maintenance once every six months.
Usually all glasses are washed together in the optical shop, which is easy to be infected. Individuals only need to do daily cleaning and maintenance, remove protein regularly every week, and only need to send it back to the original factory of contact lens company for maintenance once every six months.
10. The dioxide disinfection system must be neutralized before it can be used.
Because the dioxygen disinfection system uses 3% hydrogen peroxide (the same as that used in general trauma), it is necessary to use a white gold ring or a neutralization tablet to avoid burning eyes. For example, the neutralization effect of platinum ring will decrease with the increase of use times. It is recommended to replace the platinum ring at the same time every time you change the new potion. In addition, disposable contact lenses with high water content should not be disinfected by dioxygen system, and the lenses will be deformed.
1 1. If your eyes are red, you'd better take off your contact lenses first.
As long as the eyes are red, photophobia, tears and other discomfort, it is best to take off your contact lenses immediately and take them to see a doctor to see what the problem is. The cornea of contact lenses is usually fragile, and most people's vision is already quite damaged by the time their vision is blurred.
12. Replace the contact lens storage box regularly.
The You Mei Clinic in the United States suggests that the storage box and the basket for placing lenses should be cleaned every day. In addition, Dong Xiaoqing suggested scalding it with hot water every week, cleaning it with neutral lotion and drying it. Replace the storage box and lens basket once every six months or so. It is best not to put it in the bathroom, because it is easy to get moldy when wet.