A contact lens, also known as a corrective lens, is a thin lens placed directly on the surface of the eye. Contact lenses are used to correct vision, for cosmetic or therapeutic purposes. There are two main types of contact lenses: those that correct refractive error and those that provide continuous vision correction without glasses or surgery (e.g., Orthokeratology).
The first contact lenses were made from glass; however, modern day contact lenses are typically made from flexible plastics such as polymethyl methacrylate (PMMA), fluoropolymers, silicone hydrogels, or Smart Lens technology. The latter is a new type of contact lens material that is designed to allow more oxygen to reach the cornea. This is important because oxygen is essential for maintaining healthy corneal cells.
There are many different manufacturers of contact lenses and each offers a variety of products with different features. For example, some companies offer disposable contact lenses while others offer extended wear options. Some brands focus on specific needs such as astigmatism or presbyopia while others may be more general in their offerings.
When choosing a brand of contacts, it is important to consult with an optometrist or ophthalmologist to find out which type would be best suited for your individual needs. It is also important to follow the care instructions provided by the manufacturer in order to ensure proper cleaning and disinfection of the lenses.