What is difference in hard contact lenses and other lenses?

Many differences: Rigid contact lenses provide excellent vision, often much better than soft lenses, and are generally much cheaper to wear. A pair will often last 2 or 3 years. They are easier to put in and harder to take out than soft lenses. They are more difficult to get used to. For certain eye problems, like lots of astigmatism or irregular corneas, they are the best method of vision correction.