Editing Contact lens (section)

==Prescriptions==
[[File:Lens Basecurve.jpg|thumb|alt=Diagram of a circle with the diameter labeled "D" and the radius labeled "r" and "BC"|Diameter and base curve radius]]

The parameters specified in a contact lens prescription may include:

* Brand name
* Material
* [[Base curve radius]] (BC, BCR)
* [[Diameter]] (D, OAD)
* [[Optical power]] in [[diopter]]s (dpt)
* Center thickness (CT)

Prescriptions for contact lenses and [[glasses]] may be similar but are not interchangeable. Prescribing of contact lenses is usually restricted to various combinations of [[ophthalmologist]]s, [[optometrist]]s and [[optician]]s. An [[eye examination]] is needed to determine an individual's suitability for contact lens wear. This typically includes a [[refraction]] to determine the proper power of the lens and an assessment of the health of the eye's anterior segment. Many eye diseases inhibit contact lens wear, such as active infections, allergies, and dry eye.<ref>Agarwal, R.K. (1970), Some reasons for not fitting contact lenses, The Optician, 4 December, page 623 (published in London, England).</ref> [[Keratometer|Keratometry]] is especially important in the fitting of rigid lenses.

===United States===
Contact lenses are prescribed by [[ophthalmologist]]s, [[optometrist]]s, or specially licensed [[optician]]s under the supervision of an eye doctor. They are typically ordered at the same office that conducts the eye exam and fitting. The [[Fairness to Contact Lens Consumers Act]] guarantees consumers a copy of their contact lens prescription, allowing them to obtain lenses at the provider of their choice.<ref name="FCLCA">[http://www.gpo.gov/fdsys/pkg/PLAW-108publ164/html/PLAW-108publ164.htm "Fairness to Contact Lens Consumers Act"]. 15 October 2003.</ref>