Contact lenses are thin, curved lenses that are placed directly on the surface of the eye to correct vision problems. They are a popular alternative to eyeglasses for those who prefer a more natural look or greater convenience. Contact lenses come in various types, including soft lenses, rigid gas permeable lenses, and hybrid lenses. They can correct nearsightedness, farsightedness, astigmatism, and presbyopia. Contact lenses require proper care and maintenance to prevent eye infections and other complications. It is important to follow the instructions provided by an eye care professional when wearing contact lenses.