Contact lenses are thin, curved lenses placed directly on the surface of the eyes to improve vision or change eye appearance. They are a popular alternative to glasses because they offer a natural field of view and are almost invisible when worn.

There are different types of lenses, including daily wear, monthly, colored, and cosmetic lenses. Prescription lenses help correct vision problems like myopia, hyperopia, and astigmatism, while colored lenses are used to enhance or completely change eye color for fashion and beauty purposes.

Modern lenses are designed to be soft, breathable, and comfortable, allowing oxygen to reach the eyes for safe extended wear. They are widely used for both medical and aesthetic reasons, giving users clear vision along with style versatility.