How to choose the water content of contact lenses?
Many people have a wrong understanding of the parameter of water content in contact lenses. They think that the higher the water content in the lens, the better. But in fact, lenses with high water content are more likely to cause dry eyes. So, how can we choose the right moisture content of contact lenses for ourselves?
The higher the moisture content of the contact lens, the softer the lens texture is indeed, but this moisture ratio is fixed, the lens will absorb tears from the surface of the eye to replenish moisture after dehydration, so it is more likely to cause dry eyes. On the contrary, contact lenses with low water content can lock in water for a long time, and are relatively more suitable for people with dry eyes.
Generally speaking, lenses with high water content are more likely to be damaged and deformed, and are easier to absorb protein precipitation and other substances, so their life cycle is shorter and can only be used to make short-period disposable lenses. The lenses with low water content have thicker texture, longer service life and better durability, but the oxygen permeability is slightly worse.
Therefore, under the same material conditions, although the higher the water content of the lens, the higher the oxygen permeability and the more comfortable to wear, but the higher the water content is by no means the better. You should not blindly pursue high-water content contact lenses. If the eyes are prone to dryness, it is safer to choose a water content of 38%-42%. However, the material of silicon hydrogel breaks the limitation of the oxygen permeability of the lens, and can be designed with a higher water content. If its price can be accepted, it will be a good choice.
All in all, you must understand the parameters when wearing contact lenses. Only according to your actual situation and wearing needs can you find the most suitable style.