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This article is from the Vision and Eye Care FAQ, by grants@research.canon.com.au (Grant Sayer) with numerous contributions by others.

3.2.4 Extended Wear

Lens manufactured from a high-water content material and/or with a very
thin centre thickness to enable maximum oxygen transmission. Lenses can
be worn overnight, or for a number of days without removal (see
comments on complications for further information).

 

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