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A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.
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The dioptre adjustment mechanism of a pair of binoculars.
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Any lens system, such as a telescope.
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A theodolite or similar surveyor’s angle measuring device.
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An alidade.
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A surgical speculum.
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An instrument for drawing the skull by projections.
In addition, there is no diopter correction to help focus the image for those of us with less than perfect vision.
Over-the-counter reading glasses can typically be found in diopter strengths up to 3.0, though not all styles will be available in all strengths.
The chart at Visacuity can help you determine the diopter strength that you need.
To the right is the viewfinder with a rubber eyecup, under which is a Diopter adjustment knob.
A diopter correction knob, located on the side of the EVF, is used to focus the image on the screen.
You can also choose to use the electronic viewfinder with diopter correction.
This can be corrected with a higher diopter measurement for glasses or the adoption of bifocal or trifocal lenses as needed.
As the child enters school, distance vision becomes critical for learning, and children with prescriptions of at least 1.00 diopter of myopia or who have 20/40 vision or worse should be given glasses.
Diopter (D)-A unit of measure for describing the refractive power of a lens.
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