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. What is long-sightedness? In the case of long-sightedness [...] g. a wet road, it is also polarised - this time oscillating horizontally - and cannot pass through the polarisation filter. In this way, the strong glare caused by reflections in particular is filtered [...] watching television, 0.5 for reading the newspaper and 0.7 for reading a telephone directory. Is the ability of the eye to read solely dependent on visual acuity? No. In order to be able to read we require
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