ANSWERS: 1
  • Hard contact lenses were the first contact lenses, introduced in the 1960s. They were difficult to wear and caused many problems for wearers. Today, semi-soft contact lenses are the "new" hard lens.

    Significance

    Semi-soft contact lenses are gas-permeable. These lenses also are known as RGPs.

    Features

    Semi-soft contact lenses are made of plastic combined with silicone, fluoropolymers and other materials. This allows oxygen to flow through the lens.

    Benefits

    An advantage of semi-soft contact lenses is that they are durable and hold their shape.

    Prevention/Solution

    Some vision problems, including astigmatism, are better corrected by semi-soft contact lenses because they offer clearer vision.

    Potential

    Semi-soft contact lenses are available as extended wear lenses and may be worn overnight.

    Source:

    The University of Michigan Kellogg Eye Center: Eye Conditions

    Web MD: Eye Health and Contact Lenses

    More Information:

    All About Vision

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