What is a characteristic of a prescription for contact lenses?

A prescription for contact lenses is distinct from a prescription for spectacles in that it encompasses more detailed specifications to ensure proper fitting and comfort for the patient. The inclusion of power and base curve measurements is essential because the power of the lens corrects the refractive error, while the base curve influences how the contact lens interacts with the curvature of the cornea.

The base curve corresponds to the curvature of the front surface of the contact lens and must fit well against the eye to ensure stability and comfort. An improper base curve can lead to discomfort, excessive movement, or inadequate vision correction. Therefore, both power and base curve are critical components of a contact lens prescription.

While some prescribers may recommend a specific brand or material, it is not a universal requirement on all prescriptions. The primary aim is to ensure the lens fits correctly and meets the patient's visual needs, which is why power and base curve are paramount.