Disposable Lenses

These are made of a soft polymer/plastic material and water.

• The water incorporated into the lens material allows essential oxygen to reach the surface of the eye.
• There are a variety of types of soft disposable lenses ranging from those that are discarded every day through to those that can be used continuously, including overnight, for up to a month or more.
• The most obvious benefit to the wearer is that they become comfortable as soon as they are inserted.
• Disposable soft lenses are more hygienic as they need less cleaning before being thrown away.
• There are other soft lenses that can be worn for up to a year, on a daily basis, until they need to be replaced.
• The disadvantages are that soft lenses are easily damaged and rip or tear easily, so take care to keep the finger nails short!
• They also absorb soap, make up, and similar pollutants more easily than rigid gas permeable lenses.
• As they do not last as long and are easily damaged they will be more expensive over a period of time.

Gas Permeable Lenses

Known as RGPs (rigid gas permeable) or GP (gas permeable).

• More flexible than the material used in the original hard lenses, they allow oxygen to pass through the surface to the eye making them more comfortable and helping to maintain eye health.
• Their advantages over soft lenses include better vision, last longer and are better at resisting harmful deposits in the eye.
• They are easier to clean and as they last longer, they are not as expensive as soft lenses over the longer term.
• Their principal disadvantage over soft lenses is that they take longer to become comfortable to wear and should be used regularly and frequently, daily is best.
• Some people will experience temporary vision blur when the lenses are removed even when they are replaced with ordinary spectacles.
• They also require care and attention when carrying out the daily cleaning routine but are not as easily damaged as soft lenses.
• A recent development consists of an outer soft ring surrounding an inner GP, this allows for a greater degree of comfort to add to the advantages of GP lenses.

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