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Glossary of Ophthalmic Terms
beginning with letter P
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pebble
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noun
  1. A small stone
  2. (geology) A rock fragment between 4 and 64 millimetres in diameter (especially a naturally rounded one)
  3. (curling) A small droplet of water intentionally sprayed on the ice that cause irregularities on the surface.
verb to pebble
  1. To pave with pebbles.
  2. (curling) To deposit water droplets on the ice. e.g. to pebble the ice between games.
perimeter
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noun
  1. (mathematics) The sum of the distance of all the lengths of the sides of an object.
  2. The outer limits of an area. See Synonyms at circumference.
  3. (mathematics) The length of such a boundary.
  4. A fortified strip or boundary usually protecting a military position.
photogene
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noun
  1. (dated) An afterimage
photopia
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noun
  1. Normal daylight vision, in which the cone cells are used
presbyopia
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noun
  1. inability, Inability of the eye, due to ageing, to focus on nearby objects
purblind
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adjective
  1. Partially blind.
  2. Lacking in discernment or understanding.
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