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Written by: Xu Yun, Photography: Wu Minhui
The cornea is located at the front of the eyeball. Not only does it protect the eye from injury or infection, but it also allows light to enter the eyeball. Only the cornea and lens in the eye structure can be replaced. In some cases, the replaced cornea will no longer be transparent and clear, and vision will deteriorate. Affected; Ophthalmologist Fan Jingyan analyzed why wearing “big eyes” in addition to the hidden traps of the CON artifact increases the risk of keratitis and whether the cornea can heal naturally once it is damaged.
Guest Host: Wu Xianglun
What is the difference between wearing contact lenses and wearing “big eyes”?
The surface of contact lenses is transparent. A layer of pigment is added to the surface of “Big Eyes”. Studies have shown that the pigment content creates uneven surfaces. Compared to smooth surfaces, rough surfaces are more likely to collect bacteria or amoebas. Therefore, wearing “big eyes” may increase the risk of corneal infection; “Big eyes” can be purchased in many ways on the market, unlike contact lenses, which require a doctor or optician to check and select the appropriate lenses before wearing, so both There is a big difference between them.
A layer of pigment forms on the surface of the large eyes, where bacteria can easily accumulate.
Why do big eyes increase the risk of keratitis?
Keratitis is an infection of the front part of the eye that can be caused by bacteria, viruses, fungi, or even amoebas. Contact lenses come into contact with the cornea, so the risk is higher. If you wear “big eyes” because the lens pigments cause bumps and the risk of infection is higher. Furthermore, the oxygen permeability of lenses with pigmented parts has always been questioned. Low oxygen permeability of lenses is harmful to the health of the cornea. Some “big eye” products claim that the oxygen permeability is undoubtedly the same as contact lenses, but the research has not been confirmed, so consumers should be careful before use.
Can I avoid a bacterial infection by using CON remover?
In general, it is recommended to use clean hands when wearing or removing contact lenses. There is no research to show that CON remover can effectively prevent infections. On the contrary, CON remover is not a disposable product. If used without thorough cleaning, the risk of viral infection increases. There is a risk of fungal or fungal infection. In addition, if the clamping part of the lens is used with improper force, it may be pulled off and damage the corneal epidermis.
Dr. Fan pointed out that removing the CON artifact increases the risk of corneal infection.
Does daily eye makeup or eyeliner tattooing affect the cornea?
If handled carefully, this does not pose a problem. However, if cosmetics or certain substances are applied to the eyes for a long time, there is a possibility that the surface of the cornea will be affected. However, as far as the eyeliner tattoo is concerned, this is only the case. However, during tattooing, the instrument can be accidentally damaged. Injury to the cornea or accidental entry of the anesthetic into the eye during injection will cause damage to the cornea and cause pain, which may lead to watering of the eyes, etc., and even lead to loss of vision due to infection. Therefore, special caution is required when taking these steps and the associated treatments.
Under what circumstances is the cornea damaged?
Fan Jingyan: If sand or foreign objects accidentally get into the eyes during projects such as decoration or welding, there is a possibility that the cornea will be damaged. Dry eye syndrome can also easily damage the corneal epidermis. Some allergic symptoms include long-term use of steroids. If the cornea is infected by herpes or viruses, chipping or damage to the corneal epidermis may occur. Because the eyelids are close to the cornea, the eyelashes are inverted and the eyelids are entropized. These repeated frictions also damage the corneal epidermis.
The cornea is located at the front of the eye. If damaged, it can affect vision.
What are the symptoms of corneal damage? Will it heal naturally?
In most cases, the eyes hurt and watery and red eyes appear. In severe cases, it affects vision. Some people feel uncomfortable when their eyes are dry and blown by the wind. The cornea is divided into the epidermis and middle part and underlying endothelial cells. If only the epidermis is affected, we speak of damage to the epithelial cells. For example, when the surface of the skin is scratched, it heals naturally. Injury to the middle part can affect vision. The endothelium part is damaged. If the cells are lost, they cannot be repaired. In some cases, corneal infections and inflammation affect the middle layer. After recovery, vision decreases.
Can eye drops repair damaged cells?
This depends on the damaged area. The epidermis heals naturally after damage. Using eye drops or artificial tears can help the wound heal faster. If the middle or bottom layer is damaged, eye drops may not be helpful, especially the underlying cells are damaged and cannot be restored with eye drops. Since some eye drops also contain preservatives, choosing eye drops that are too dense will have an impact on the eyes. Since dry eyes require eye drops, the use of preservatives is recommended. free. Agent products.
Doctor profile
Fan Jingyan – Bachelor of Medicine and Surgery from the University of Hong Kong, Fellow of the Royal College of Physicians of Edinburgh (Ophthalmology), Fellow of the British College of Ophthalmologists, Fellow of the Hong Kong Academy of Medicine (Ophthalmology), Fellow of the Department of Surgery from the Royal College of Physicians in Glasgow, United Kingdom, Master of Public Health from the University of Hong Kong.
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