cannot be used during the 4-hour charging period. What is a dioptre? A dioptre (dpt) is the unit of measurement of the optical power of a lens. In the case of spectacle lenses, negative dioptre values correct [...] correct long-sightedness. The dioptre is equal to the reciprocal value of the focal length of a lens measured in metres: a power of +5 dpt therefore has a reciprocal length of 1/5 metres or 20 centimetres. [...] with which an object is focused on the retina. Visual acuity (VA) is the most common clinical measurement of visual function. If the visual acuity is corrected through the use of glasses or other vision
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