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Why choose silicone hydrogel contact lenses?

Although the number of hydrogel contact lenses is superior, they have always been unsatisfactory in terms of oxygen permeability. From hydrogel to silicone hydrogel, it can be said that a qualitative leap has been achieved. So, as the best contact eye at the moment, what is so good about silicone hydrogel?

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Silicone hydrogel is a very hydrophilic organic polymer material with high oxygen permeability. From the perspective of eye health, the key issue that contact lenses need to address is to improve oxygen permeability. Ordinary hydrogel contact lenses rely on the water contained in the lens as a carrier to deliver oxygen to the cornea, but the transport capacity of water is very limited and evaporates relatively easily.However, the addition of silicon makes a big difference.Silicone monomers have a loose structure and low intermolecular forces, and the solubility of oxygen in them is very high, which makes the oxygen permeability of silicone hydrogels as much as five times higher than that of ordinary lenses.

The problem that oxygen permeability must depend on water content has been solved,and other advantages have been brought about.

If the water content of ordinary lenses is increased, as the wearing time increases, the water evaporates and is replenished through tears, leading to dryness of both eyes.

However, silicone hydrogel has a proper water content, and the water remains stable even after wearing, so it is not easy to produce dryness, and the lenses are soft and comfortable while allowing the cornea to breathe freely.

As a result

contact lenses made from silicone hydrogel are always hydrated and breathable, improving comfort and reducing damage to the eyes, advantages that are unmatched by regular contact lenses.Although silicone hydrogel can only be used to make short-cycle disposable lenses and cannot be applied to annual and semi-annual disposables, it is still the best choice of all products.

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Post time: Aug-16-2022