dioptres
Optical power units
Dioptres is the British spelling of diopters, a unit measuring the optical power of a lens or curved mirror.
One dioptre equals the reciprocal of the focal length in meters.
Eyeglass prescriptions use dioptres to specify correction strength: My glasses are minus three dioptres.
Higher values indicate stronger corrective power.
Fixing of mistakes
- lensesCurved transparent refractors
- eyeglassesCorrective lenses worn
- spectaclesCorrective eyewear worn daily
- glassesCorrective eyewear or tumblers
optician · ophthalmologist · optometrist · prescription · refraction · eye exam · focal length · power
Standard measures of quantity
- scaleMeasure of relative size
- vergenceOpposite eye movements together
- focal lengthLens-to-convergence-point distance
- positiveAffirming or certain
negative · plus · minus · calibration · precision · sphere · cylinder · axis
Blurry distance vision
- hyperopiaDifficulty seeing nearby objects
- astigmatismIrregular corneal curvature disorder
- presbyopiaAge-related near vision loss
- nearsightednessDefective distant vision
farsightedness · refractive error · visual impairment · blurred vision · eye strain · accommodation · corrective lenses · vision therapy
correction
Fixing of mistakes
- lensesCurved transparent refractors
- eyeglassesCorrective lenses worn
- spectaclesCorrective eyewear worn daily
glasses · optician · ophthalmologist · optometrist · prescription · refraction · eye exam · focal length · power · strength
units
Standard measures of quantity
- scaleMeasure of relative size
- vergenceOpposite eye movements together
- focal lengthLens-to-convergence-point distance
positive · negative · plus · minus · calibration · precision · sphere · cylinder · axis
myopia
Blurry distance vision
- hyperopiaDifficulty seeing nearby objects
- astigmatismIrregular corneal curvature disorder
- presbyopiaAge-related near vision loss
nearsightedness · farsightedness · refractive error · visual impairment · blurred vision · eye strain · accommodation · corrective lenses · vision therapy