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The number of SiH lenses sold between 2004 and 2006 quadrupled, driven in part by the introduction of SiH lenses marketed for daily wear and further developments in lens materials. Early SiH lenses were marketed for continuous wear use and offered extremely high levels of oxygen transmission that reduced the level of overnight corneal swelling to approximately 4 per cent2 compared to levels of approximately 10 per cent oedema with hydrogel lenses.3 However, two of the major causes of discontinuation of contact lens wear are still discomfort and dryness,3 factors unrelated to oxygen transmission.
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