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diopter

n. 屈光度

屈光度

WordNet (r) 3.0 (2006) (WordNet)

diopter
n 1: a unit of measurement of the refractive power of a lens
which is equal to the reciprocal of the focal length
measured in meters; used by oculists [synonym: {diopter},
{dioptre}]

The Collaborative International Dictionary of English v.0.48 (gcide)

Diopter \Di*op"ter\, Dioptra \Di*op"tra\, n. [L. dioptra, fr.
Gr. ?. See 2d {Dioptric}.]
An optical instrument, invented by Hipparchus, for taking
altitudes, leveling, etc.
[1913 Webster]

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英文字典中文字典相关资料:

What Is A Diopter? - All About Vision
A diopter is an optical unit used to calculate the focusing strength of a pair of glasses or contact lenses And it is the measurement unit for a glasses or contact lens prescription
Dioptre - Wikipedia
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
Understanding Diopters: A Guide to Optical Measurement and . . . - eyeweb
The basic unit of measurement in optometry, diopters, is used to express the optical power of prescription lenses They are made expressly to gauge the way a lens bends or refracts light to properly focus it onto the retina
How Are Reading Glasses Measured: Diopters Explained
Reading glasses are measured in units called diopters, marked with a plus sign and a number like +1 00 or +2 50 The number represents how much magnifying power the lens provides Over-the-counter reading glasses typically range from +1 00 to +3 50, increasing in small steps of 0 25 diopters
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
How to Read Your Eyeglasses Prescription - All About Vision
Lens power, or prescription strength, is written in diopters (D): If the number under this heading has a minus sign (-), you are nearsighted If the number under this heading has a plus sign (+), you are farsighted Prescriptions are stronger the further away this number is from zero
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 or bifocals, as well as telescopes other magnifying lenses
Reading Glasses Strength Chart: Find Your Perfect Diopter Easily
Diopters measure how much magnification a lens provides The higher the number, the stronger the magnification As a general rule, the closer you need to hold reading material to see clearly, the stronger the diopter you may need
What Is a Diopter? How Lens Strength Is Measured
What is a diopter on an eye prescription? Learn about what diopters are and how they're measured to better understand your prescription

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