Arizona State Board Of Optometry Practice Exam

Which of the following is NOT a requirement for a contact lens prescription?

1. Power

2. Material

3. Size

4. Tint (if applicable)

The correct answer is: Size

In the context of a contact lens prescription, the requirement for "size" is not universally mandated like the other parameters. The crucial elements of a contact lens prescription typically include the power, which determines the corrective strength of the lens; the material, which specifies the type of material used to manufacture the lenses, affecting their oxygen permeability and overall comfort; and tint, which is important for colored lenses or for specific light-filtering purposes, but only if applicable to the lens type prescribed. While the size or diameter of the contact lens is important for ensuring a proper fit, it is not always explicitly included in every prescription as a mandatory requirement in all cases. Certain lenses, particularly soft lenses, can come in standardized sizes that fit a majority of patients without needing specific measurements listed in the prescription, depending on the practitioner’s discretion. Thus, size is not a strict requirement for all types of contact lens prescriptions, making it the correct answer to the question.