Hard lenses, also known as rigid gas permeable (RGP) lenses, are a type of contact lens made from durable plastic materials. They maintain their shape on the eye, providing clear vision by correcting various refractive errors such as myopia (nearsightedness) and hyperopia (farsightedness). Unlike soft lenses, hard lenses allow oxygen to pass through to the cornea, promoting eye health. These lenses are typically smaller than soft lenses and can take some time to get used to. They are known for their longevity and can last for several years with proper care. Regular cleaning and maintenance are essential to ensure comfort and optimal vision.