Be careful, Not Everyone is Suitable for Wearing Meitong Contact Lenses
There are three main uses of contact lenses: one is for correcting ametropia, the other is for the treatment of eye diseases, and the third is for beauty.
For contact lenses for eye treatment, because they are used under the guidance of doctors, there are generally no serious complications. Contact lenses used to correct ametropia require optometry, so at least part of their use is under the guidance of doctors, and there are few serious complications. For the color contact lenses used for cosmetic purposes, because at present, China is still in the state of "free" sale and "free" use, and the quality is uneven, the chances of serious complications are significantly increased.
What are the manifestations of eye injury?
The specific damages to the eyes are mainly as follows:
First, it affects night vision: because the periphery of color contact lenses are colored, the diameter of the circular hole left in the middle is fixed, but the pupil of human eyes needs to expand or shrink with the brightness of light. Generally speaking, at night, the pupil of the human eye is usually larger than 6mm. Therefore, long-term wearing such color contact lenses can affect the visual range and clarity at night.
Second, corneal edema and corneal mechanical damage: color contact lenses hinder the cornea from getting oxygen from the air. Corneal hypoxia causes corneal epithelial cell edema and easy peeling, which is easy to cause mechanical damage to corneal epithelium when wearing or removing lenses. Such as red eyes, fear of light, tears, blurred vision.
Third, giant mastoid conjunctivitis: it is mainly caused by the contact between the lens and conjunctiva, repeated friction stimulation when opening and closing the eyes, or allergic reaction to the lens itself or disinfectant. For example, red stone garnet like protrusions can be seen in the conjunctiva of the eyelid. In severe cases, the eyes are red, itchy and have many secretions. After wearing glasses, there will be lens displacement, blurred vision, foreign body feeling, etc.
Fourth, the color substance leaks out and damages the eyes: because the color of the color contact lens penetrates into the lens, if the production technology is not qualified, there may be a risk of the color substance leaking out and damaging the eyes.
When choosing contact lenses, you should first do the necessary examination and consultation. Be sure to buy qualified products produced through testing. And carefully read the product instructions and ask the fitting inspector about the use methods and precautions. Avoid wearing it over time. It's best not to wear it overnight. Recheck at the matching lens regularly to check whether there is any damage to the lens. In addition, do not wear colored contact lenses in a windy and sandy environment or when swimming.
What is the difference between color contact lenses and non color contact lenses?
Non color contact lenses are generally dyed with light blue. The purpose is to increase the visibility of the lens and facilitate nursing operation. Its function of correcting vision is basically the same as that of color glasses. Color contact lenses, also known as beautiful pupil lenses, are not only used to correct vision, but also used in beauty and medical treatment. Through a certain concentration of color lenses to change the color of iris, it has a fashionable beauty effect, which is generally needed by individuals and occupations. In clinical application, it is generally used to cover corneal leukoplakia, play the role of artificial pupil in iris defect, and wearing red contact lenses can also change the color blind eye's distinction between red and green color brightness, but it can not improve the color discrimination ability in essence. Because the color coating of Meitong lens is embedded in the middle of the lens, which is more than that of non-color contact lenses, its thickness also increases relatively, which reduces the oxygen conductivity (Dk / L) of Meitong lens. Generally speaking, the oxygen permeability (DK) is directly proportional to the water content. The water content of some beautiful pupil lenses can reach 58%, which has high oxygen permeability and satisfactory durability. However, because most of them are ionic materials, it is also very easy to form precipitation.
Thank you for reading
009@mikeeyewear.com
Mike Optical
4-14-2022
