Videodiopter

/dai'ɔptə/ Cách viết khác : (dioptre) /dai'ɔptə/

Learn the precise meaning of diopter, a fundamental unit used in optics to measure the refractive power of lenses. This lesson explains how oculists calculate this value using the reciprocal of a lens's focal length in meters and how it applies to everyday items like eyeglasses and magnifying glasses. We also explore practical applications such as the diopter adjustment found on cameras and microscopes, along with the British spelling variant and related adjective forms. Watch this lesson to master the terminology used to describe optical strength and vision correction.

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diopter
An optometrist uses a diopter to measure a patient's eyeglass prescription.