Help and frequently asked questions

What are hard lenses?


The original ‘hard’ lenses were made from Perspex – a material that is impervious to oxygen and hence limited the supply of oxygen to the surface of the cornea.  Hard lenses are rarely used today, have been replaced by ‘Rigid Gas Permeable’ materials.  This type of lens is slightly more flexible than a hard lens but is not as immediately comfortable as a soft contact lens.