Hard contact lenses are rigid lenses made from durable materials that provide clear vision correction for various eye conditions. Unlike soft lenses, they maintain their shape on the eye, which can help with sharper vision, especially for those with astigmatism. These lenses are typically smaller than soft lenses and require a period of adjustment for new users. They are known for their longevity and can be easier to clean and maintain. However, they may not be as comfortable initially, and some users may prefer the feel of soft contact lenses.