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diopter    
n. 屈光度

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  • Dioptre - Wikipedia
    Illustration of the relationship between optical power in dioptres and focal length in metres A dioptre (British spelling) or diopter (American spelling), symbol dpt or D, is a unit of measurement with dimension of reciprocal length, equivalent to one reciprocal metre, 1 dpt = 1 m−1 It is normally used to express the optical power of a lens or curved mirror, which is a physical quantity
  • What Is A Diopter? - All About Vision
    A diopter is a unit that is used to calculate the focusing strength of a pair of glasses or contact lenses It is the unit used for an optical prescription
  • Understanding Diopters: A Guide to Optical Measurement and . . . - eyeweb
    The diopter strength is inversely correlated with this characteristic The term "they" refers to the measurement used to determine the optical power and light-bending capability of a lens There is an obvious connection between diopters and focal length: as the focal length decreases, increases the diopter value
  • What Is a Diopter and How Does It Measure Vision?
    The diopter is the standard unit of measurement used to quantify the optical power of a lens or curved mirror, which measures its ability to bend or refract light rays This unit is foundational to optics and is used to calculate the focusing strength of corrective lenses like eyeglasses and contact lenses It ensures that the necessary vision correction is accurately translated into a
  • How Are Reading Glasses Measured: Diopters Explained
    Learn what diopters are, how reading glass strength is measured, and when store-bought readers are a fine choice versus when you need a prescription
  • What Is a Diopter? - Warby Parker
    A diopter is a unit of measurement for a lens’s focusing power Learn more about what a diopter measures and how diopters vary by prescription
  • Optical Diopter Strength Explained - Focusers
    Diopter strength refers to the optical power of a lens It's commonly applied to reader-strength eyeglasses, as well as telescopes other magnifying lenses Lenses with a focal length - defined as the distance between the center of a lens and its focal point - of 1 meter (about 39 inches) have a diopter strength of 1
  • Magnification vs Diopter: Complete Guide 2026
    Learn the difference between diopter and magnification measurements Convert between optical powers with our calculator and chart Essential guide for photographers and optical users
  • What is a Diopter? | Visionworks
    A diopter is a critical unit of measurement in optics that quantifies the refractive power of lenses used in eyeglasses and contact lenses It indicates the degree to which a lens must bend light to properly focus it onto the retina, correcting visual impairments Understanding diopters helps individuals and eye care professionals in choosing the right strength for corrective lenses for clear
  • Magnification vs. Diopter: Understanding the Difference
    If you're having trouble determining the difference between magnification and diopter, or how to convert between the two, let our guide help you out





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