ANSWERS: 1
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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
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