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Contact lenses made from these materials are called rigid gas permeable lenses or 'RGPs'. A rigid lens is able to cover the natural shape of the cornea with a new refracting surface. This means that a spherical rigid contact lens can correct corneal astigmatism.
Soft contact lenses may be easier to adjust to and are more comfortable than rigid gas permeable lenses. Newer soft lens materials include silicone-hydrogels to provide more oxygen to your eye while you wear your lenses.
A rigid gas-permeable lens, also known as an RGP lens, GP lens, or colloquially, a hard contact lens, is a rigid contact lens made of oxygen -permeable polymers.
Long-term use of PMMA or thick hydrogel contact lenses have been found to cause corneal warpage (shape distortion). There is some evidence to show that rigid gas permeable contact lenses are capable of slowing myopic progression after long-term wear.
Orthokeratology lenses are made by a number of companies and all use special gas-permeable contact lenses to reshape the cornea. The lens material – and especially its oxygen permeability measured by its 'Dk' rating (the higher the value, the greater the degree of oxygen permeability) – is important for maintaining eye-health during the ...
A lens clock can also be used to estimate the thickness of thin objects, such as a hard or gas-permeable contact lens. Ideally, a contact lens dial thickness gauge would be used for this, but a lens clock can be used if a dial thickness gauge is not available.