Contact lenses also have a shelf life, and "extended service" is not conducive to eye health.
According to the length of wearing time, contact lenses can be divided into different types, such as daily throwing, monthly throwing, seasonal throwing, semi-annual throwing and annual throwing.
Some people think that month, season and half a year refer to the total wearing time of glasses, but Ma Lin, director of corneal department of Tianjin Eye Hospital, said in an interview with Beifang.com that month, season and half a year actually refer to the shelf life of glasses after opening. Take the contact lenses that have been thrown away for half a year as an example. Half a year means that the glasses belong to expired products after being opened for half a year.
Extended data:
Hazards of contact lenses:
1, experts said that compared with ordinary glasses, because contact lenses contact the surface of the eyeball, the risk is greater, especially the risk of discoloration of the color-changing film is greater, so more attention should be paid. Experts suggest using artificial tears or cleansing oil test. If you have discoloration problems, you should stop using them to avoid eye allergies. If you wear it continuously, it may eventually lead to corneal ulceration.
2. Due to the increase of dyeing design in cosmetic contact lenses, apart from the problem of fading, it is more likely to cause corneal hypoxia than ordinary contact lenses. In particular, most people who like to use color-changing films are young people, who often wear them for a long time and even sleep with them. In addition, their vigilance is low, and they remain indifferent when the cornea is slightly infected. Finally, the cornea may be infected by Pseudomonas aeruginosa, which will affect their vision and even require corneal transplantation. So be very careful.
3. Experts say that people with allergic conjunctivitis are not suitable to wear contact lenses, because it is more likely to cause bacterial infection and corneal inflammation; In addition, Netease suffers from dry eye for a long time, tears are reduced, and it is also easy to be infected with bacteria; However, the sudden drop of hormone in postmenopausal women also leads to the decrease of tear secretion, which is not suitable.
People's Network-How to wear contact lenses safely?
People's Network-There are many kinds of contact lenses. Come and see which one suits you best.