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The main difference between hard lenses and rigid semi-permeable lenses is rigid semi-permeable contacts allow oxygen to pass through the lens to the eye, while hard contacts do not allow oxygen to pass through the lens. Both types of lenses are ideal for those who require an inflexible contact lens which will help to reshape their cornea. Those with an astigmatism benefit most from a hard lens because the lenses have an orthokeratology effect in which a series of flatter lenses are used to achieve a desired cornea shape.