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Types of Contact Lenses Based on their Lens Material

Woman attaching her contact lensContact lenses are the perfect solution for people who need correction of their vision but do not want to wear eyeglasses. Before you get yourself a pair at a Maple Grove vision clinic, though, you need to know what type of contacts best suits you. Here is some basic information on contact lenses based on their material.

Soft Lenses

Flexible hydrophilic plastics make up soft lenses. Some people refer to them as hydrogels, since they have a water content of around 38-75% by weight. Soft contacts with moderate amounts of water are thinner than those with higher water contents.

Soft lenses allow passage of oxygen, keeping your cornea healthy. This characteristic also makes them comfortable to wear. Newer soft contact lenses have silicone within the hydrogels, allowing increased transmission of oxygen, making them a safe option for extended wear.

Rigid Contact Lenses

You may have heard of these as gas permeable lenses. They also allow oxygen to pass through them, but they have an insignificant amount of water and depend on their microscopic porous nature for oxygen transmission to your cornea.

Specialists classify them based on a measure of the lens’ oxygen permeability known as the Dk value. Lenses with a high Dk value allow more oxygen to pass through compared to those with a low value. Rigid contacts provide a higher visual acuity compared to soft contacts.

Hybrid Lenses

Specialists design these lenses to combine the comfort of soft contacts and the clear vision of rigid lenses. They contain a rigid gas permeable center, and a fitting zone of silicone hydrogel or hydrogel material encircles it. They are costly to replace and hard to fit, making them a less attractive option for most people.

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Before you get your lenses, an optician at the vision clinic will conduct an eye and eyesight evaluation to determine your visual acuity. You can then discuss what type of lenses will best serve your needs. Don’t let blurred vision bother you any longer.

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