dioptre การใช้

• :I doubt . 25 dioptres would make much difference.
• In humans, the total optical power of the relaxed eye is approximately 60 dioptres.
• Optometrists usually measure refractive error using lenses graded in steps of 0.25 dioptres.
• I have a prescription of-4 dioptre for reading and-6 for distance.
• Dioptres are also sometimes used for other reciprocals of distance, particularly vergence of optical beams.
• Reading glasses will be rated at + 1.00 to + 3.00 dioptres.
• Dioptre is a unit for the power of lenses, not a measure of visual acuity.
• :Some people wear contact lenses ( with diopters ) with tinted sunglasses ( without dioptres ).
• If the focal length is in metres, this gives the optical power in dioptres ( inverse metres ).
• This allows for a readout in both refractive power ( dioptres ) and radius of curvature ( millimeters ).
• The cornea accounts for approximately two-thirds of this refractive power ( about 40 dioptres ) and the suspensory ligaments.
• A typical magnifying glass might have a focal length of 25 cm, corresponding to an optical power of 4 dioptres.
• It found that the focometer results were within 0.75 dioptres of the autorefractor value 84 % of the time.
• If the  deviation exceeds 50 prism dioptres, such that a single prism bar cannot be used, prisms can either be stacked or split
• Though the dioptre is based on the DIN specify a unit name ( dioptrie, dioptria, etc . ) and derived unit symbol " dpt ".
• In humans, the refractive power of the lens in its natural environment is approximately 18 dioptres, roughly one-third of the eye's total power.
• Mammals, birds and reptiles vary the optical power by changing the form of the elastic lens using the ciliary body ( in humans up to 15 dioptres ).
• Throughout the episode, the production crew used split dioptres in certain scenes, a camera technique where two separate camera angles are at the same focus on screen.
• People with severe myopia _ who need lenses with a focusing power of more than 6 dioptres _ run a greater risk of glaucoma and retinal detachment later in life.
• In the case of corrective lenses prescribed for myopia, a prescription informally referred to as " 200 " actually refers a lens of-2.0 dioptres power.