Dioptre
noun
The unit of measurement used to describe the power of a lens, such as a glasses or telescope lens.
My glasses have a power of -2.5 dioptres, which means I'm nearsighted.
Often appears as...
- optical dioptre
- lens power in dioptres
Usage tips
Technical
noun
A device used to measure the distance between objects in the sky, used mainly in ancient times.
The ancient astronomers used a simple dioptre to measure the angular distance between stars.
Usage tips
Historical
noun
The unit of measurement used to describe the power of a lens, such as a glasses or telescope lens.
My glasses have a power of -2.5 dioptres, which means I'm nearsighted.
Often appears as...
- optical dioptre
- lens power in dioptres
Usage tips
Technical
noun
A device used to measure the distance between objects in the sky, used mainly in ancient times.
The ancient astronomers used a simple dioptre to measure the angular distance between stars.
Usage tips
Historical
Definition 1 of 2
Pro Tip 1/3Vision Correction
Used to specify the correction strength needed for eyeglasses or contact lenses.
My prescription reads -1.75 dioptres in my left eye.
Pro Tip 2/3Positive and Negative
Positive dioptres for farsightedness; Negative for nearsightedness.
She needs glasses with +3.0 dioptres to read.
Pro Tip 3/3Precision Matters
A small change in dioptres can significantly affect vision clarity.
I need to update my lenses to 0.25 dioptres stronger.
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