Contact Lens Prescriptions
The parameters specified in a contact lenses prescription may include:
- Material / Brand name
- Base curve radius (BC, BCR)
- Diameter (D, OAD)
- Power in diopters
- Center thickness (CT)
Prescriptions for contact lenses and glasses may be similar, but are not interchangeable. While every country is different, the prescribing of contact lenses is usually restricted to various combinations of ophthalmologists, optometrists and opticians. An eye examination is needed to determine an individual's suitability for contact lenses. This typically includes a refraction to determine the proper power of the lens and an assessment of the health of the anterior segment of the eye. Many eye diseases can prohibit contact lens wear, such as active infections, allergies, and dry eye. Keratometry is especially important in the fitting of rigid lenses.
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