Definitions

1. noun

A unit of measurement for the refractive power of a lens, equal to the reciprocal of the focal length in metres.

“The ophthalmologist prescribed glasses with a diopter power of -3.0 to correct the patient’s nearsightedness.”

2. noun

A unit of measurement for the refractive power of a lens, equal to one meter of focal length.

“The camera lens has a diopter power of +2.0 for capturing high-quality images at close range.”

3. noun

A unit of measurement for the refractive power of a lens, used to express the power of corrective lenses, such as glasses or contact lenses.

“The optometrist recommended a diopter power of +4.0 to correct the patient’s farsightedness.”