What is the difference between hard gas permeable (HGP) and soft contact lenses?
HGP’s usually are about a 9mm diameter and made from a non-flexible material. They are initially less comfortable and take several weeks for adaptation. They correct astigmatism. Soft contact lenses are usually of a 14mm diameter and are flexible. They are easier to adapt to and are usually disposable. Toric soft lenses to correct astigmatism are available.
