Types of contact lenses
Soft disposable contact lenses are made from a flexible water-absorbing (hydrophilic) material that conforms to the shape of the eye and allows oxygen to pass through to the eyes:
- Daily disposable lenses, discarded after one day’s use, are the healthiest and most convenient lenses.
- Bi-weekly or monthly disposable lenses are removed each night, cleaned and stored.
- Extended wear lenses do not need to be removed at night.
Astigmatic or toric contact lenses correct astigmatism, an irregular curvature of the cornea. They have a dual prescription and are weighted to stay correctly positioned.
Multifocal contact lenses provide zones for different prescriptions, such as for reading and distance.
Monovision achieves a bifocal effect by using lenses with two different prescriptions — the distance prescription in one eye and the near prescription in the other.
Rigid gas permeable are made of plastic and are long lasting. They can be a good choice for some patients with astigmatism, keratoconus, or multifocal prescriptions.
Custom contact lenses come in both soft and rigid gas permeable forms. They are most often used by patients with irregularly shaped eyes or too much astigmatism.