What is the appropriate water content of cosmetic contact lenses? Is 38 or 40 better?

When I was buying cosmetic contact lenses, I found that there is a standard for the water content of cosmetic contact lenses. What is the most suitable water content for these contact lenses? Is a water content of 38% or 40% better?

Normally, a moisture content of 35%-38% is sufficient.

The water content of cosmetic contact lenses refers to the proportion of water in the lens. The higher the water content, the more moist the contact lens is, the better the oxygen permeability is, and the more comfortable the lens is to wear. Therefore, many people mistakenly believe that the higher the water content, the better. In fact, this is not the case. The higher the water content of cosmetic contact lenses, the more water "nourishment" the cosmetic contact lenses need.

38% is a low water content and is suitable for long-term wear. A water content of about 38% is just right for wearing for more than 7 hours. The higher the water content of the cosmetic contact lenses, the more moisturized they are and the more nourishing they are to wear. Water content is often expressed as a percentage. Usually, a water content of less than 38% is a low water content, 42%-60% is a medium water content, and above 60% is a high water content. But don't mistakenly think that the higher the water content, the better, because as the wearing time increases, the water content of the lens and the eye water are exchanged, and the air is exposed to evaporation, and the high water content lenses will absorb eye water, causing dry eyes and discomfort.

(1) Short-term wear: If you only wear them for a short time (about 3 hours), you can choose contact lenses with high water content, which will be more comfortable.

(2) Long-term wear: If you wear it for a long time (more than 7 hours), you can choose contact lenses with a water content of about 38%, which will be more suitable.

1. Low water content in contact lenses: The water content of contact lenses refers to the ratio of the amount of water in the lens to the total mass of the lens, which is used to measure the softness and oxygen permeability of the lens. Contact lenses with low water content have a water content of less than 40%. This type of contact lens has high hardness, so it has good formability and can be worn for a long time. However, contact lenses with low water content have poor oxygen permeability and are not soft enough, so they are not comfortable to wear.

2. High water content in cosmetic contact lenses: The higher the water content, the softer the lens, and therefore the easier it is to break and deform. Cosmetic contact lenses with a water content greater than 50% also have good oxygen permeability and are comfortable to wear at first, but as the wearing time increases, the lens loses moisture and absorbs moisture from the eyeball to maintain a high water content, thus causing dry eyes. Because of the high water content, cosmetic contact lenses are prone to protein and other sediments, and their service life is not long.

There are more and more brands of colored contact lenses, and each brand of colored contact lenses has its own unique characteristics.

The more active brands include: Johnson & Johnson cosmetic contact lenses, Bausch & Lomb, Haichang, BESCON, NEO, etc.

Bausch and Lomb is the earliest contact lens manufacturer, Johnson & Johnson is the "pioneer" of colored contact lenses, the performance and price of Haichang contact lenses are very consistent with the Chinese people's requirements for contact lenses, and BESCON and NEO are mainly favored by many fashion gurus because of their exaggerated and rich colors.

To choose the contact lenses that suit you based on your actual situation, you must buy them in a regular store.