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Specific Gravity On RGP Contact Lenses

Before we start, specific gravity on rgp contact lenses. What does this mean?

The specific gravity refers to the density of the material which constitutes the object, in comparison to water. The objects, in this case, are RGP or Rigid Gas Permeable contact lenses. Specific gravity can be estimated or measured accurately.

RGP lenses are commonly known as 'hard' lenses, as opposed to the soft variety which are made of a much more pliable material. When contact lenses were first widely introduced in the late 1960's, the material was rigid plastic. They were not permeable, and most importantly, did not let oxygen through to the eyes.

In the mid 1980's, Gas permeable contact lenses were introduced, which were made of silicone. Silicone allows oxygen to pass through it, and hence to the eye. In fact, RGP lenses allow more oxygen to pass to the eye than do soft contact lenses. They are also more robust and hard wearing.

The specific gravity on rgp contact lenses can vary, depending on the lens. Or put another way, you have a choice as to the specific gravity of a contact lens. If you need a lens with a defined specific gravity, then you can shop around and have a reasonable chance of finding what you need.

Contamac US, Inc. for example, have launched four Optimum GP contact lens materials and solutions.

These new high-quality GP (oxygen permeable) contact lens materials are available in four different options to fit the needs of each different contact lens wearer. Optimum Classic, Comfort, Extra, and Extreme each have their own specifications of oxygen permeability, wettability, refractive index, and specific gravity. The options ensure maximum comfort and visual performance. There’s a specific GP solution for each option and all are manufactured by Lobob.

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The article was written by Charlie Cory, who is the owner of FX Eyes, a website dedicated to providing advice about buying special effects contact lenses online.

You can visit his website about special effects contact lenses.