They are available for most prescriptions and require minimal care because they are frequently replaced. Either soft or RGP lenses, these can usually be worn for up to 7 days without removal. Because of the continuous wear, more frequent visits to the eye doctor for follow-up care may be required. These lenses may provide sharper vision than soft lenses and can be used to correct most vision problems. They are also more durable and easier to care for, but often require a longer adaptation period.
Spherical contact lenses Soft or hard contact lens that contain a single prescription power.
Aspheric contact lenses Premium contact lenses for borderline astigmatic patients and for those who are just beginning to develop presbyopia. Toric contact lenses Soft or hard contact lenses that contain both a spherical and cylinder component to correct prescriptions that have astigmatism. These lenses may be thicker in one area than another in order to maintain correct orientation on the eye. Several different designs are available depending on the specific needs and adaptability of the patient. A term sometimes used in a special contact lens fitting technique that is an alternative to bifocal contacts.